/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 07:17:23,220 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:17:23,222 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:17:23,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 07:17:23,263 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 07:17:23,264 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 07:17:23,266 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 07:17:23,268 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 07:17:23,270 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 07:17:23,271 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 07:17:23,273 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 07:17:23,274 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 07:17:23,274 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:17:23,276 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:17:23,277 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:17:23,278 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:17:23,279 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:17:23,280 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:17:23,282 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:17:23,284 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:17:23,286 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:17:23,290 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:17:23,292 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:17:23,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:17:23,296 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:17:23,306 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:17:23,307 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:17:23,308 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:17:23,313 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:17:23,340 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:17:23,340 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:17:23,342 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:17:23,342 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:17:23,342 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:17:23,343 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:17:23,343 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:17:23,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:17:23,360 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:17:23,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:17:23,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:17:23,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:17:23,361 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:17:23,361 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:17:23,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:17:23,362 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:17:23,363 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:17:23,363 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:17:23,363 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:17:23,364 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:17:23,364 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:17:23,364 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:17:23,364 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:17:23,365 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:17:23,365 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:17:23,365 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:17:23,831 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:17:23,860 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:17:23,864 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:17:23,865 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:17:23,866 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:17:23,867 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c [2020-12-22 07:17:23,956 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df0e880cd/1fb0295ef31049c0a22f45fd258a365a/FLAG19293b030 [2020-12-22 07:17:24,722 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:17:24,725 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c [2020-12-22 07:17:24,745 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df0e880cd/1fb0295ef31049c0a22f45fd258a365a/FLAG19293b030 [2020-12-22 07:17:24,972 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df0e880cd/1fb0295ef31049c0a22f45fd258a365a [2020-12-22 07:17:24,976 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:17:24,979 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:17:24,980 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:17:24,981 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:17:24,986 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:17:24,986 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:17:24" (1/1) ... [2020-12-22 07:17:24,988 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d3003c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:24, skipping insertion in model container [2020-12-22 07:17:24,988 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:17:24" (1/1) ... [2020-12-22 07:17:24,997 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:17:25,033 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:17:25,328 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c[11348,11361] [2020-12-22 07:17:25,335 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:17:25,361 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:17:25,482 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c[11348,11361] [2020-12-22 07:17:25,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:17:25,518 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:17:25,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25 WrapperNode [2020-12-22 07:17:25,518 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:17:25,520 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:17:25,520 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:17:25,520 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:17:25,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,560 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,626 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:17:25,627 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:17:25,627 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:17:25,627 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:17:25,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,641 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,651 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,660 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... [2020-12-22 07:17:25,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:17:25,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:17:25,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:17:25,671 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:17:25,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:17:25,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:17:25,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:17:25,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:17:25,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:17:26,585 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:17:26,586 INFO L299 CfgBuilder]: Removed 17 assume(true) statements. [2020-12-22 07:17:26,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:17:26 BoogieIcfgContainer [2020-12-22 07:17:26,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:17:26,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:17:26,591 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:17:26,595 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:17:26,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:17:24" (1/3) ... [2020-12-22 07:17:26,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d058b13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:17:26, skipping insertion in model container [2020-12-22 07:17:26,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:17:25" (2/3) ... [2020-12-22 07:17:26,597 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d058b13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:17:26, skipping insertion in model container [2020-12-22 07:17:26,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:17:26" (3/3) ... [2020-12-22 07:17:26,599 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.1.ufo.BOUNDED-6.pals.c [2020-12-22 07:17:26,606 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:17:26,613 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:17:26,634 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:17:26,665 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:17:26,666 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:17:26,666 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:17:26,666 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:17:26,666 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:17:26,667 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:17:26,667 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:17:26,667 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:17:26,686 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states. [2020-12-22 07:17:26,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-22 07:17:26,695 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:26,696 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:26,697 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:26,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:26,704 INFO L82 PathProgramCache]: Analyzing trace with hash 632685314, now seen corresponding path program 1 times [2020-12-22 07:17:26,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:26,714 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16589512] [2020-12-22 07:17:26,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:27,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:27,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:27,214 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16589512] [2020-12-22 07:17:27,215 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:27,216 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-22 07:17:27,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997787865] [2020-12-22 07:17:27,222 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-22 07:17:27,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:27,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-22 07:17:27,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 07:17:27,246 INFO L87 Difference]: Start difference. First operand 125 states. Second operand 2 states. [2020-12-22 07:17:27,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:27,306 INFO L93 Difference]: Finished difference Result 200 states and 340 transitions. [2020-12-22 07:17:27,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-22 07:17:27,308 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 37 [2020-12-22 07:17:27,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:27,338 INFO L225 Difference]: With dead ends: 200 [2020-12-22 07:17:27,340 INFO L226 Difference]: Without dead ends: 121 [2020-12-22 07:17:27,346 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 07:17:27,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-12-22 07:17:27,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-12-22 07:17:27,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-12-22 07:17:27,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 208 transitions. [2020-12-22 07:17:27,414 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 208 transitions. Word has length 37 [2020-12-22 07:17:27,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:27,416 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 208 transitions. [2020-12-22 07:17:27,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-22 07:17:27,416 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 208 transitions. [2020-12-22 07:17:27,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-22 07:17:27,421 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:27,421 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:27,423 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:17:27,423 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:27,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:27,425 INFO L82 PathProgramCache]: Analyzing trace with hash -184963136, now seen corresponding path program 1 times [2020-12-22 07:17:27,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:27,427 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484683749] [2020-12-22 07:17:27,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:27,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:27,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:27,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484683749] [2020-12-22 07:17:27,562 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:27,562 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:17:27,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520533010] [2020-12-22 07:17:27,563 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:17:27,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:27,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:17:27,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:27,565 INFO L87 Difference]: Start difference. First operand 121 states and 208 transitions. Second operand 5 states. [2020-12-22 07:17:27,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:27,684 INFO L93 Difference]: Finished difference Result 265 states and 448 transitions. [2020-12-22 07:17:27,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 07:17:27,685 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2020-12-22 07:17:27,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:27,690 INFO L225 Difference]: With dead ends: 265 [2020-12-22 07:17:27,690 INFO L226 Difference]: Without dead ends: 191 [2020-12-22 07:17:27,695 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-22 07:17:27,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2020-12-22 07:17:27,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 121. [2020-12-22 07:17:27,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-12-22 07:17:27,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 187 transitions. [2020-12-22 07:17:27,722 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 187 transitions. Word has length 37 [2020-12-22 07:17:27,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:27,723 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 187 transitions. [2020-12-22 07:17:27,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:17:27,723 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 187 transitions. [2020-12-22 07:17:27,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-22 07:17:27,727 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:27,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:27,728 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:17:27,728 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:27,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:27,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1843152740, now seen corresponding path program 1 times [2020-12-22 07:17:27,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:27,731 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986170573] [2020-12-22 07:17:27,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:27,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:27,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:27,840 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986170573] [2020-12-22 07:17:27,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:27,841 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:27,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192901026] [2020-12-22 07:17:27,841 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:27,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:27,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:27,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:27,843 INFO L87 Difference]: Start difference. First operand 121 states and 187 transitions. Second operand 3 states. [2020-12-22 07:17:27,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:27,912 INFO L93 Difference]: Finished difference Result 252 states and 406 transitions. [2020-12-22 07:17:27,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:27,912 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 57 [2020-12-22 07:17:27,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:27,917 INFO L225 Difference]: With dead ends: 252 [2020-12-22 07:17:27,917 INFO L226 Difference]: Without dead ends: 182 [2020-12-22 07:17:27,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:27,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2020-12-22 07:17:27,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 180. [2020-12-22 07:17:27,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-12-22 07:17:27,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 282 transitions. [2020-12-22 07:17:27,958 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 282 transitions. Word has length 57 [2020-12-22 07:17:27,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:27,959 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 282 transitions. [2020-12-22 07:17:27,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:27,960 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 282 transitions. [2020-12-22 07:17:27,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-22 07:17:27,964 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:27,964 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:27,966 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-22 07:17:27,967 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:27,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:27,967 INFO L82 PathProgramCache]: Analyzing trace with hash 700379209, now seen corresponding path program 1 times [2020-12-22 07:17:27,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:27,968 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302081507] [2020-12-22 07:17:27,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:28,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:28,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:28,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302081507] [2020-12-22 07:17:28,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:28,094 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:28,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934534320] [2020-12-22 07:17:28,094 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:28,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:28,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:28,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,096 INFO L87 Difference]: Start difference. First operand 180 states and 282 transitions. Second operand 3 states. [2020-12-22 07:17:28,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:28,130 INFO L93 Difference]: Finished difference Result 307 states and 495 transitions. [2020-12-22 07:17:28,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:28,131 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 59 [2020-12-22 07:17:28,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:28,134 INFO L225 Difference]: With dead ends: 307 [2020-12-22 07:17:28,134 INFO L226 Difference]: Without dead ends: 237 [2020-12-22 07:17:28,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-12-22 07:17:28,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 235. [2020-12-22 07:17:28,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-12-22 07:17:28,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 374 transitions. [2020-12-22 07:17:28,165 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 374 transitions. Word has length 59 [2020-12-22 07:17:28,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:28,167 INFO L481 AbstractCegarLoop]: Abstraction has 235 states and 374 transitions. [2020-12-22 07:17:28,167 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:28,167 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 374 transitions. [2020-12-22 07:17:28,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-22 07:17:28,174 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:28,175 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:28,175 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 07:17:28,175 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:28,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:28,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1943315629, now seen corresponding path program 1 times [2020-12-22 07:17:28,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:28,176 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078612585] [2020-12-22 07:17:28,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:28,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:28,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:28,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078612585] [2020-12-22 07:17:28,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:28,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:28,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145254147] [2020-12-22 07:17:28,340 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:28,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:28,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:28,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,341 INFO L87 Difference]: Start difference. First operand 235 states and 374 transitions. Second operand 3 states. [2020-12-22 07:17:28,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:28,399 INFO L93 Difference]: Finished difference Result 578 states and 941 transitions. [2020-12-22 07:17:28,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:28,401 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 59 [2020-12-22 07:17:28,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:28,405 INFO L225 Difference]: With dead ends: 578 [2020-12-22 07:17:28,406 INFO L226 Difference]: Without dead ends: 396 [2020-12-22 07:17:28,408 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-12-22 07:17:28,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 394. [2020-12-22 07:17:28,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2020-12-22 07:17:28,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 634 transitions. [2020-12-22 07:17:28,441 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 634 transitions. Word has length 59 [2020-12-22 07:17:28,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:28,442 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 634 transitions. [2020-12-22 07:17:28,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:28,442 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 634 transitions. [2020-12-22 07:17:28,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-22 07:17:28,443 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:28,443 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:28,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-22 07:17:28,444 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:28,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:28,445 INFO L82 PathProgramCache]: Analyzing trace with hash -1342077512, now seen corresponding path program 1 times [2020-12-22 07:17:28,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:28,445 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866268234] [2020-12-22 07:17:28,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:28,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:28,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:28,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866268234] [2020-12-22 07:17:28,550 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:28,550 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:28,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118702374] [2020-12-22 07:17:28,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:28,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:28,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:28,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,555 INFO L87 Difference]: Start difference. First operand 394 states and 634 transitions. Second operand 3 states. [2020-12-22 07:17:28,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:28,601 INFO L93 Difference]: Finished difference Result 723 states and 1177 transitions. [2020-12-22 07:17:28,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:28,602 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 61 [2020-12-22 07:17:28,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:28,606 INFO L225 Difference]: With dead ends: 723 [2020-12-22 07:17:28,606 INFO L226 Difference]: Without dead ends: 541 [2020-12-22 07:17:28,608 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-12-22 07:17:28,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 539. [2020-12-22 07:17:28,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2020-12-22 07:17:28,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 869 transitions. [2020-12-22 07:17:28,639 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 869 transitions. Word has length 61 [2020-12-22 07:17:28,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:28,639 INFO L481 AbstractCegarLoop]: Abstraction has 539 states and 869 transitions. [2020-12-22 07:17:28,639 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:28,639 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 869 transitions. [2020-12-22 07:17:28,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-22 07:17:28,640 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:28,640 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:28,640 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-12-22 07:17:28,640 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:28,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:28,642 INFO L82 PathProgramCache]: Analyzing trace with hash -308214334, now seen corresponding path program 1 times [2020-12-22 07:17:28,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:28,647 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312792904] [2020-12-22 07:17:28,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:28,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:28,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:28,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312792904] [2020-12-22 07:17:28,750 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:28,750 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:28,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270815994] [2020-12-22 07:17:28,751 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:28,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:28,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:28,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,752 INFO L87 Difference]: Start difference. First operand 539 states and 869 transitions. Second operand 3 states. [2020-12-22 07:17:28,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:28,793 INFO L93 Difference]: Finished difference Result 1428 states and 2320 transitions. [2020-12-22 07:17:28,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:28,794 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 61 [2020-12-22 07:17:28,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:28,800 INFO L225 Difference]: With dead ends: 1428 [2020-12-22 07:17:28,800 INFO L226 Difference]: Without dead ends: 952 [2020-12-22 07:17:28,802 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 952 states. [2020-12-22 07:17:28,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 952 to 950. [2020-12-22 07:17:28,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 950 states. [2020-12-22 07:17:28,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 950 states to 950 states and 1526 transitions. [2020-12-22 07:17:28,839 INFO L78 Accepts]: Start accepts. Automaton has 950 states and 1526 transitions. Word has length 61 [2020-12-22 07:17:28,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:28,839 INFO L481 AbstractCegarLoop]: Abstraction has 950 states and 1526 transitions. [2020-12-22 07:17:28,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:28,839 INFO L276 IsEmpty]: Start isEmpty. Operand 950 states and 1526 transitions. [2020-12-22 07:17:28,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-22 07:17:28,840 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:28,840 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:28,841 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-22 07:17:28,841 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:28,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:28,841 INFO L82 PathProgramCache]: Analyzing trace with hash 349619889, now seen corresponding path program 1 times [2020-12-22 07:17:28,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:28,842 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410927542] [2020-12-22 07:17:28,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:28,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:28,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:28,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410927542] [2020-12-22 07:17:28,974 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:28,974 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:17:28,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247238846] [2020-12-22 07:17:28,975 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:17:28,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:28,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:17:28,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:28,977 INFO L87 Difference]: Start difference. First operand 950 states and 1526 transitions. Second operand 5 states. [2020-12-22 07:17:29,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:29,232 INFO L93 Difference]: Finished difference Result 4661 states and 7632 transitions. [2020-12-22 07:17:29,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 07:17:29,233 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 63 [2020-12-22 07:17:29,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:29,260 INFO L225 Difference]: With dead ends: 4661 [2020-12-22 07:17:29,261 INFO L226 Difference]: Without dead ends: 3774 [2020-12-22 07:17:29,264 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-12-22 07:17:29,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3774 states. [2020-12-22 07:17:29,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3774 to 1770. [2020-12-22 07:17:29,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1770 states. [2020-12-22 07:17:29,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1770 states to 1770 states and 2844 transitions. [2020-12-22 07:17:29,389 INFO L78 Accepts]: Start accepts. Automaton has 1770 states and 2844 transitions. Word has length 63 [2020-12-22 07:17:29,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:29,389 INFO L481 AbstractCegarLoop]: Abstraction has 1770 states and 2844 transitions. [2020-12-22 07:17:29,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:17:29,390 INFO L276 IsEmpty]: Start isEmpty. Operand 1770 states and 2844 transitions. [2020-12-22 07:17:29,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-22 07:17:29,390 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:29,391 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:29,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-12-22 07:17:29,391 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:29,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:29,392 INFO L82 PathProgramCache]: Analyzing trace with hash 325449286, now seen corresponding path program 1 times [2020-12-22 07:17:29,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:29,392 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411917928] [2020-12-22 07:17:29,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:29,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:29,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:29,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411917928] [2020-12-22 07:17:29,451 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:29,451 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:29,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572520527] [2020-12-22 07:17:29,452 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:29,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:29,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:29,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:29,453 INFO L87 Difference]: Start difference. First operand 1770 states and 2844 transitions. Second operand 4 states. [2020-12-22 07:17:29,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:29,656 INFO L93 Difference]: Finished difference Result 5679 states and 9231 transitions. [2020-12-22 07:17:29,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:29,657 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 64 [2020-12-22 07:17:29,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:29,679 INFO L225 Difference]: With dead ends: 5679 [2020-12-22 07:17:29,679 INFO L226 Difference]: Without dead ends: 3972 [2020-12-22 07:17:29,686 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:29,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3972 states. [2020-12-22 07:17:29,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3972 to 2858. [2020-12-22 07:17:29,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2858 states. [2020-12-22 07:17:29,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2858 states to 2858 states and 4602 transitions. [2020-12-22 07:17:29,842 INFO L78 Accepts]: Start accepts. Automaton has 2858 states and 4602 transitions. Word has length 64 [2020-12-22 07:17:29,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:29,842 INFO L481 AbstractCegarLoop]: Abstraction has 2858 states and 4602 transitions. [2020-12-22 07:17:29,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:29,843 INFO L276 IsEmpty]: Start isEmpty. Operand 2858 states and 4602 transitions. [2020-12-22 07:17:29,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-22 07:17:29,846 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:29,846 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:29,846 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-12-22 07:17:29,847 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:29,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:29,847 INFO L82 PathProgramCache]: Analyzing trace with hash 905685231, now seen corresponding path program 1 times [2020-12-22 07:17:29,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:29,849 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807153754] [2020-12-22 07:17:29,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:29,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:29,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:29,924 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807153754] [2020-12-22 07:17:29,924 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:29,924 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:29,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915276358] [2020-12-22 07:17:29,925 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:29,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:29,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:29,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:29,929 INFO L87 Difference]: Start difference. First operand 2858 states and 4602 transitions. Second operand 3 states. [2020-12-22 07:17:30,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:30,085 INFO L93 Difference]: Finished difference Result 5558 states and 8983 transitions. [2020-12-22 07:17:30,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:30,086 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 64 [2020-12-22 07:17:30,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:30,109 INFO L225 Difference]: With dead ends: 5558 [2020-12-22 07:17:30,109 INFO L226 Difference]: Without dead ends: 3988 [2020-12-22 07:17:30,114 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:30,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3988 states. [2020-12-22 07:17:30,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3988 to 3986. [2020-12-22 07:17:30,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3986 states. [2020-12-22 07:17:30,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3986 states to 3986 states and 6378 transitions. [2020-12-22 07:17:30,314 INFO L78 Accepts]: Start accepts. Automaton has 3986 states and 6378 transitions. Word has length 64 [2020-12-22 07:17:30,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:30,315 INFO L481 AbstractCegarLoop]: Abstraction has 3986 states and 6378 transitions. [2020-12-22 07:17:30,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:30,315 INFO L276 IsEmpty]: Start isEmpty. Operand 3986 states and 6378 transitions. [2020-12-22 07:17:30,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-22 07:17:30,320 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:30,320 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:30,320 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-12-22 07:17:30,320 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:30,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:30,321 INFO L82 PathProgramCache]: Analyzing trace with hash -254835064, now seen corresponding path program 1 times [2020-12-22 07:17:30,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:30,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951910210] [2020-12-22 07:17:30,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:30,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:30,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:30,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951910210] [2020-12-22 07:17:30,455 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:30,455 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:30,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194212433] [2020-12-22 07:17:30,456 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:30,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:30,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:30,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:30,459 INFO L87 Difference]: Start difference. First operand 3986 states and 6378 transitions. Second operand 4 states. [2020-12-22 07:17:30,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:30,841 INFO L93 Difference]: Finished difference Result 13012 states and 20908 transitions. [2020-12-22 07:17:30,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:30,842 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 65 [2020-12-22 07:17:30,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:30,913 INFO L225 Difference]: With dead ends: 13012 [2020-12-22 07:17:30,913 INFO L226 Difference]: Without dead ends: 9099 [2020-12-22 07:17:30,921 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:30,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9099 states. [2020-12-22 07:17:31,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9099 to 6382. [2020-12-22 07:17:31,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6382 states. [2020-12-22 07:17:31,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6382 states to 6382 states and 10158 transitions. [2020-12-22 07:17:31,324 INFO L78 Accepts]: Start accepts. Automaton has 6382 states and 10158 transitions. Word has length 65 [2020-12-22 07:17:31,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:31,324 INFO L481 AbstractCegarLoop]: Abstraction has 6382 states and 10158 transitions. [2020-12-22 07:17:31,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:31,325 INFO L276 IsEmpty]: Start isEmpty. Operand 6382 states and 10158 transitions. [2020-12-22 07:17:31,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-22 07:17:31,326 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:31,326 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:31,326 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-12-22 07:17:31,326 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:31,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:31,332 INFO L82 PathProgramCache]: Analyzing trace with hash -894776387, now seen corresponding path program 1 times [2020-12-22 07:17:31,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:31,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858647640] [2020-12-22 07:17:31,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:31,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:31,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:31,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858647640] [2020-12-22 07:17:31,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:31,405 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:31,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837693742] [2020-12-22 07:17:31,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:31,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:31,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:31,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:31,407 INFO L87 Difference]: Start difference. First operand 6382 states and 10158 transitions. Second operand 4 states. [2020-12-22 07:17:31,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:31,960 INFO L93 Difference]: Finished difference Result 20041 states and 32013 transitions. [2020-12-22 07:17:31,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:31,960 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 66 [2020-12-22 07:17:31,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:31,994 INFO L225 Difference]: With dead ends: 20041 [2020-12-22 07:17:31,995 INFO L226 Difference]: Without dead ends: 13732 [2020-12-22 07:17:32,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:32,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13732 states. [2020-12-22 07:17:32,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13732 to 10014. [2020-12-22 07:17:32,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10014 states. [2020-12-22 07:17:32,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10014 states to 10014 states and 15850 transitions. [2020-12-22 07:17:32,543 INFO L78 Accepts]: Start accepts. Automaton has 10014 states and 15850 transitions. Word has length 66 [2020-12-22 07:17:32,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:32,547 INFO L481 AbstractCegarLoop]: Abstraction has 10014 states and 15850 transitions. [2020-12-22 07:17:32,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:32,548 INFO L276 IsEmpty]: Start isEmpty. Operand 10014 states and 15850 transitions. [2020-12-22 07:17:32,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-22 07:17:32,548 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:32,549 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:32,549 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-12-22 07:17:32,549 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:32,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:32,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1280795893, now seen corresponding path program 1 times [2020-12-22 07:17:32,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:32,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224067948] [2020-12-22 07:17:32,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:32,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:32,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:32,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224067948] [2020-12-22 07:17:32,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:32,668 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:32,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607051672] [2020-12-22 07:17:32,669 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:32,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:32,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:32,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:32,670 INFO L87 Difference]: Start difference. First operand 10014 states and 15850 transitions. Second operand 4 states. [2020-12-22 07:17:33,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:33,607 INFO L93 Difference]: Finished difference Result 29670 states and 46944 transitions. [2020-12-22 07:17:33,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:33,608 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 68 [2020-12-22 07:17:33,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:33,659 INFO L225 Difference]: With dead ends: 29670 [2020-12-22 07:17:33,660 INFO L226 Difference]: Without dead ends: 19665 [2020-12-22 07:17:33,678 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:33,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19665 states. [2020-12-22 07:17:34,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19665 to 19663. [2020-12-22 07:17:34,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19663 states. [2020-12-22 07:17:34,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19663 states to 19663 states and 30882 transitions. [2020-12-22 07:17:34,761 INFO L78 Accepts]: Start accepts. Automaton has 19663 states and 30882 transitions. Word has length 68 [2020-12-22 07:17:34,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:34,762 INFO L481 AbstractCegarLoop]: Abstraction has 19663 states and 30882 transitions. [2020-12-22 07:17:34,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:34,762 INFO L276 IsEmpty]: Start isEmpty. Operand 19663 states and 30882 transitions. [2020-12-22 07:17:34,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-22 07:17:34,764 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:34,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:34,764 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-12-22 07:17:34,765 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:34,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:34,765 INFO L82 PathProgramCache]: Analyzing trace with hash 2079556393, now seen corresponding path program 1 times [2020-12-22 07:17:34,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:34,766 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507884354] [2020-12-22 07:17:34,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:34,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:34,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:34,813 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507884354] [2020-12-22 07:17:34,813 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:34,814 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:34,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844238099] [2020-12-22 07:17:34,814 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:34,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:34,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:34,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:34,815 INFO L87 Difference]: Start difference. First operand 19663 states and 30882 transitions. Second operand 3 states. [2020-12-22 07:17:36,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:36,264 INFO L93 Difference]: Finished difference Result 58951 states and 92584 transitions. [2020-12-22 07:17:36,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:36,264 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 69 [2020-12-22 07:17:36,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:36,371 INFO L225 Difference]: With dead ends: 58951 [2020-12-22 07:17:36,371 INFO L226 Difference]: Without dead ends: 39316 [2020-12-22 07:17:36,401 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:36,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39316 states. [2020-12-22 07:17:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39316 to 19665. [2020-12-22 07:17:37,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19665 states. [2020-12-22 07:17:37,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19665 states to 19665 states and 30884 transitions. [2020-12-22 07:17:37,599 INFO L78 Accepts]: Start accepts. Automaton has 19665 states and 30884 transitions. Word has length 69 [2020-12-22 07:17:37,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:37,600 INFO L481 AbstractCegarLoop]: Abstraction has 19665 states and 30884 transitions. [2020-12-22 07:17:37,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:37,600 INFO L276 IsEmpty]: Start isEmpty. Operand 19665 states and 30884 transitions. [2020-12-22 07:17:37,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-22 07:17:37,601 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:37,601 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:37,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-12-22 07:17:37,602 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:37,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:37,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1570079706, now seen corresponding path program 1 times [2020-12-22 07:17:37,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:37,603 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917049640] [2020-12-22 07:17:37,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:37,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:37,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:37,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917049640] [2020-12-22 07:17:37,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:37,697 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:37,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111523009] [2020-12-22 07:17:37,697 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:37,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:37,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:37,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:37,699 INFO L87 Difference]: Start difference. First operand 19665 states and 30884 transitions. Second operand 4 states. [2020-12-22 07:17:39,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:39,323 INFO L93 Difference]: Finished difference Result 58255 states and 91452 transitions. [2020-12-22 07:17:39,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:39,323 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 70 [2020-12-22 07:17:39,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:39,392 INFO L225 Difference]: With dead ends: 58255 [2020-12-22 07:17:39,392 INFO L226 Difference]: Without dead ends: 38602 [2020-12-22 07:17:39,417 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:39,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38602 states. [2020-12-22 07:17:41,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38602 to 38600. [2020-12-22 07:17:41,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38600 states. [2020-12-22 07:17:41,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38600 states to 38600 states and 60133 transitions. [2020-12-22 07:17:41,298 INFO L78 Accepts]: Start accepts. Automaton has 38600 states and 60133 transitions. Word has length 70 [2020-12-22 07:17:41,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:41,299 INFO L481 AbstractCegarLoop]: Abstraction has 38600 states and 60133 transitions. [2020-12-22 07:17:41,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:41,299 INFO L276 IsEmpty]: Start isEmpty. Operand 38600 states and 60133 transitions. [2020-12-22 07:17:41,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-22 07:17:41,300 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:41,300 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:41,301 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-12-22 07:17:41,301 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:41,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:41,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1281478281, now seen corresponding path program 1 times [2020-12-22 07:17:41,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:41,302 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072482252] [2020-12-22 07:17:41,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:41,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:41,382 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072482252] [2020-12-22 07:17:41,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:41,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:41,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274581250] [2020-12-22 07:17:41,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:41,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:41,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:41,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:41,384 INFO L87 Difference]: Start difference. First operand 38600 states and 60133 transitions. Second operand 4 states. [2020-12-22 07:17:43,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:43,988 INFO L93 Difference]: Finished difference Result 114292 states and 177947 transitions. [2020-12-22 07:17:43,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:17:43,989 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 70 [2020-12-22 07:17:43,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:44,129 INFO L225 Difference]: With dead ends: 114292 [2020-12-22 07:17:44,130 INFO L226 Difference]: Without dead ends: 75738 [2020-12-22 07:17:44,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:17:44,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75738 states. [2020-12-22 07:17:47,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75738 to 75736. [2020-12-22 07:17:47,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75736 states. [2020-12-22 07:17:47,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75736 states to 75736 states and 116983 transitions. [2020-12-22 07:17:47,585 INFO L78 Accepts]: Start accepts. Automaton has 75736 states and 116983 transitions. Word has length 70 [2020-12-22 07:17:47,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:47,585 INFO L481 AbstractCegarLoop]: Abstraction has 75736 states and 116983 transitions. [2020-12-22 07:17:47,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:17:47,585 INFO L276 IsEmpty]: Start isEmpty. Operand 75736 states and 116983 transitions. [2020-12-22 07:17:47,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-12-22 07:17:47,587 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:47,587 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:47,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-12-22 07:17:47,588 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:47,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:47,588 INFO L82 PathProgramCache]: Analyzing trace with hash 871974717, now seen corresponding path program 1 times [2020-12-22 07:17:47,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:47,589 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003708008] [2020-12-22 07:17:47,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:47,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:47,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:47,621 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003708008] [2020-12-22 07:17:47,621 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:47,622 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:17:47,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408514110] [2020-12-22 07:17:47,622 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:17:47,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:47,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:17:47,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:47,623 INFO L87 Difference]: Start difference. First operand 75736 states and 116983 transitions. Second operand 3 states. [2020-12-22 07:17:52,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:17:52,840 INFO L93 Difference]: Finished difference Result 227084 states and 350757 transitions. [2020-12-22 07:17:52,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:17:52,841 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 71 [2020-12-22 07:17:52,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:17:53,099 INFO L225 Difference]: With dead ends: 227084 [2020-12-22 07:17:53,099 INFO L226 Difference]: Without dead ends: 151422 [2020-12-22 07:17:53,179 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:17:53,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151422 states. [2020-12-22 07:17:57,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151422 to 75744. [2020-12-22 07:17:57,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75744 states. [2020-12-22 07:17:57,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75744 states to 75744 states and 116991 transitions. [2020-12-22 07:17:57,420 INFO L78 Accepts]: Start accepts. Automaton has 75744 states and 116991 transitions. Word has length 71 [2020-12-22 07:17:57,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:17:57,420 INFO L481 AbstractCegarLoop]: Abstraction has 75744 states and 116991 transitions. [2020-12-22 07:17:57,420 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:17:57,420 INFO L276 IsEmpty]: Start isEmpty. Operand 75744 states and 116991 transitions. [2020-12-22 07:17:57,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-22 07:17:57,422 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:17:57,422 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:17:57,422 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-12-22 07:17:57,422 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:17:57,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:17:57,423 INFO L82 PathProgramCache]: Analyzing trace with hash 2113454382, now seen corresponding path program 1 times [2020-12-22 07:17:57,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:17:57,423 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382238153] [2020-12-22 07:17:57,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:17:57,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:17:57,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:17:57,529 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382238153] [2020-12-22 07:17:57,529 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:17:57,529 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:17:57,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98606339] [2020-12-22 07:17:57,536 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:17:57,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:17:57,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:17:57,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:17:57,538 INFO L87 Difference]: Start difference. First operand 75744 states and 116991 transitions. Second operand 4 states. [2020-12-22 07:18:03,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:18:03,834 INFO L93 Difference]: Finished difference Result 224260 states and 346154 transitions. [2020-12-22 07:18:03,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:18:03,835 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 72 [2020-12-22 07:18:03,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:18:04,088 INFO L225 Difference]: With dead ends: 224260 [2020-12-22 07:18:04,088 INFO L226 Difference]: Without dead ends: 148571 [2020-12-22 07:18:04,159 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:18:04,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148571 states. [2020-12-22 07:18:10,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148571 to 148569. [2020-12-22 07:18:10,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148569 states. [2020-12-22 07:18:11,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148569 states to 148569 states and 227445 transitions. [2020-12-22 07:18:11,021 INFO L78 Accepts]: Start accepts. Automaton has 148569 states and 227445 transitions. Word has length 72 [2020-12-22 07:18:11,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:18:11,021 INFO L481 AbstractCegarLoop]: Abstraction has 148569 states and 227445 transitions. [2020-12-22 07:18:11,021 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:18:11,021 INFO L276 IsEmpty]: Start isEmpty. Operand 148569 states and 227445 transitions. [2020-12-22 07:18:11,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-22 07:18:11,026 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:18:11,026 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:18:11,026 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-12-22 07:18:11,026 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:18:11,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:18:11,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1932276253, now seen corresponding path program 1 times [2020-12-22 07:18:11,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:18:11,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116518004] [2020-12-22 07:18:11,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:18:11,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:18:11,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:18:11,155 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116518004] [2020-12-22 07:18:11,155 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:18:11,156 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:18:11,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661176376] [2020-12-22 07:18:11,157 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:18:11,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:18:11,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:18:11,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:18:11,159 INFO L87 Difference]: Start difference. First operand 148569 states and 227445 transitions. Second operand 4 states. [2020-12-22 07:18:23,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:18:23,059 INFO L93 Difference]: Finished difference Result 439733 states and 672639 transitions. [2020-12-22 07:18:23,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 07:18:23,059 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 72 [2020-12-22 07:18:23,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:18:23,654 INFO L225 Difference]: With dead ends: 439733 [2020-12-22 07:18:23,654 INFO L226 Difference]: Without dead ends: 291323 [2020-12-22 07:18:23,772 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:18:24,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291323 states. [2020-12-22 07:18:37,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291323 to 291321. [2020-12-22 07:18:37,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291321 states. [2020-12-22 07:18:38,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291321 states to 291321 states and 441845 transitions. [2020-12-22 07:18:38,362 INFO L78 Accepts]: Start accepts. Automaton has 291321 states and 441845 transitions. Word has length 72 [2020-12-22 07:18:38,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:18:38,362 INFO L481 AbstractCegarLoop]: Abstraction has 291321 states and 441845 transitions. [2020-12-22 07:18:38,362 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 07:18:38,363 INFO L276 IsEmpty]: Start isEmpty. Operand 291321 states and 441845 transitions. [2020-12-22 07:18:38,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-22 07:18:38,366 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:18:38,367 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:18:38,367 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-12-22 07:18:38,367 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:18:38,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:18:38,368 INFO L82 PathProgramCache]: Analyzing trace with hash 755639633, now seen corresponding path program 1 times [2020-12-22 07:18:38,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:18:38,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626415771] [2020-12-22 07:18:38,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:18:38,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:18:38,402 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:18:38,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626415771] [2020-12-22 07:18:38,403 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:18:38,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 07:18:38,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606864421] [2020-12-22 07:18:38,404 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 07:18:38,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:18:38,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 07:18:38,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:18:38,405 INFO L87 Difference]: Start difference. First operand 291321 states and 441845 transitions. Second operand 3 states. [2020-12-22 07:19:03,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:19:03,137 INFO L93 Difference]: Finished difference Result 872765 states and 1324039 transitions. [2020-12-22 07:19:03,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 07:19:03,138 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 73 [2020-12-22 07:19:03,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:19:04,551 INFO L225 Difference]: With dead ends: 872765 [2020-12-22 07:19:04,552 INFO L226 Difference]: Without dead ends: 582411 [2020-12-22 07:19:04,913 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 07:19:05,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582411 states. [2020-12-22 07:19:23,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582411 to 291353. [2020-12-22 07:19:23,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291353 states. [2020-12-22 07:19:25,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291353 states to 291353 states and 441877 transitions. [2020-12-22 07:19:25,450 INFO L78 Accepts]: Start accepts. Automaton has 291353 states and 441877 transitions. Word has length 73 [2020-12-22 07:19:25,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:19:25,451 INFO L481 AbstractCegarLoop]: Abstraction has 291353 states and 441877 transitions. [2020-12-22 07:19:25,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 07:19:25,451 INFO L276 IsEmpty]: Start isEmpty. Operand 291353 states and 441877 transitions. [2020-12-22 07:19:25,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-12-22 07:19:25,470 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:19:25,471 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:19:25,471 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-12-22 07:19:25,471 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:19:25,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:19:25,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1539955972, now seen corresponding path program 1 times [2020-12-22 07:19:25,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:19:25,477 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283352922] [2020-12-22 07:19:25,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:19:25,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:19:25,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:19:25,638 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283352922] [2020-12-22 07:19:25,639 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:19:25,639 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:19:25,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666548177] [2020-12-22 07:19:25,640 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 07:19:25,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:19:25,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 07:19:25,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-12-22 07:19:25,641 INFO L87 Difference]: Start difference. First operand 291353 states and 441877 transitions. Second operand 6 states. [2020-12-22 07:19:44,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:19:44,430 INFO L93 Difference]: Finished difference Result 441931 states and 667590 transitions. [2020-12-22 07:19:44,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 07:19:44,431 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 74 [2020-12-22 07:19:44,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:19:45,157 INFO L225 Difference]: With dead ends: 441931 [2020-12-22 07:19:45,157 INFO L226 Difference]: Without dead ends: 294265 [2020-12-22 07:19:45,321 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:19:45,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294265 states. [2020-12-22 07:20:01,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294265 to 291353. [2020-12-22 07:20:01,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291353 states. [2020-12-22 07:20:02,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291353 states to 291353 states and 439765 transitions. [2020-12-22 07:20:02,879 INFO L78 Accepts]: Start accepts. Automaton has 291353 states and 439765 transitions. Word has length 74 [2020-12-22 07:20:02,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:20:02,880 INFO L481 AbstractCegarLoop]: Abstraction has 291353 states and 439765 transitions. [2020-12-22 07:20:02,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 07:20:02,880 INFO L276 IsEmpty]: Start isEmpty. Operand 291353 states and 439765 transitions. [2020-12-22 07:20:02,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-12-22 07:20:02,886 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:20:02,887 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:20:02,887 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-12-22 07:20:02,887 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:20:02,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:20:02,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1475147646, now seen corresponding path program 1 times [2020-12-22 07:20:02,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:20:02,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097373003] [2020-12-22 07:20:02,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:20:02,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:20:02,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:20:02,980 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097373003] [2020-12-22 07:20:02,981 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:20:02,981 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 07:20:02,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833067120] [2020-12-22 07:20:02,981 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 07:20:02,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:20:02,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 07:20:02,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 07:20:02,982 INFO L87 Difference]: Start difference. First operand 291353 states and 439765 transitions. Second operand 4 states.