java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem10_label14.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:57:48,071 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:57:48,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:57:48,092 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:57:48,093 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:57:48,095 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:57:48,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:57:48,106 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:57:48,110 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:57:48,114 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:57:48,116 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:57:48,118 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:57:48,118 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:57:48,120 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:57:48,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:57:48,124 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:57:48,125 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:57:48,126 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:57:48,127 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:57:48,132 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:57:48,135 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:57:48,138 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:57:48,141 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:57:48,143 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:57:48,146 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 17:57:48,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:57:48,153 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:57:48,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:57:48,154 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:57:48,155 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:57:48,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:57:48,156 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:57:48,156 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:57:48,157 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:57:48,157 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:57:48,159 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:57:48,160 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 17:57:48,182 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:57:48,182 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:57:48,183 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:57:48,184 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:57:48,184 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:57:48,184 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:57:48,187 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:57:48,187 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:57:48,187 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:57:48,187 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:57:48,188 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:57:48,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:57:48,188 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:57:48,188 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:57:48,188 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:57:48,189 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:57:48,189 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:57:48,189 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:57:48,189 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:57:48,189 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:57:48,190 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:57:48,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:57:48,190 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:57:48,190 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:57:48,190 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:57:48,191 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:57:48,191 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:57:48,191 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:57:48,191 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:57:48,441 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:57:48,458 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:57:48,462 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:57:48,463 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:57:48,463 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:57:48,464 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label14.c [2019-10-13 17:57:48,539 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d5a68bea/53acdedd99194bb49858b80c671400c1/FLAGb300e999e [2019-10-13 17:57:49,100 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:57:49,104 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label14.c [2019-10-13 17:57:49,123 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d5a68bea/53acdedd99194bb49858b80c671400c1/FLAGb300e999e [2019-10-13 17:57:49,412 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d5a68bea/53acdedd99194bb49858b80c671400c1 [2019-10-13 17:57:49,423 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:57:49,425 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:57:49,426 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:57:49,426 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:57:49,429 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:57:49,430 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:57:49" (1/1) ... [2019-10-13 17:57:49,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@681de4fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:49, skipping insertion in model container [2019-10-13 17:57:49,433 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:57:49" (1/1) ... [2019-10-13 17:57:49,441 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:57:49,504 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:57:50,030 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:57:50,035 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:57:50,151 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:57:50,169 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:57:50,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50 WrapperNode [2019-10-13 17:57:50,170 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:57:50,171 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:57:50,171 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:57:50,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:57:50,184 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,202 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,202 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,242 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,266 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,273 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (1/1) ... [2019-10-13 17:57:50,283 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:57:50,283 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:57:50,284 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:57:50,284 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:57:50,285 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (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 [2019-10-13 17:57:50,352 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:57:50,353 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:57:50,353 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-13 17:57:50,353 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:57:50,353 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-13 17:57:50,353 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:57:50,354 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:57:50,354 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-13 17:57:50,354 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:57:50,354 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:57:50,354 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:57:51,522 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:57:51,522 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-13 17:57:51,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:57:51 BoogieIcfgContainer [2019-10-13 17:57:51,524 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:57:51,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:57:51,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:57:51,528 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:57:51,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:57:49" (1/3) ... [2019-10-13 17:57:51,529 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@553099a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:57:51, skipping insertion in model container [2019-10-13 17:57:51,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:57:50" (2/3) ... [2019-10-13 17:57:51,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@553099a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:57:51, skipping insertion in model container [2019-10-13 17:57:51,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:57:51" (3/3) ... [2019-10-13 17:57:51,532 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label14.c [2019-10-13 17:57:51,542 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:57:51,550 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:57:51,561 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:57:51,600 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:57:51,600 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:57:51,600 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:57:51,600 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:57:51,600 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:57:51,600 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:57:51,601 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:57:51,601 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:57:51,623 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2019-10-13 17:57:51,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-13 17:57:51,631 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:57:51,632 INFO L380 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] [2019-10-13 17:57:51,634 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:57:51,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:57:51,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1721053394, now seen corresponding path program 1 times [2019-10-13 17:57:51,648 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:57:51,648 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584212108] [2019-10-13 17:57:51,649 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:51,649 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:51,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:57:51,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:51,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:51,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:57:51,973 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584212108] [2019-10-13 17:57:51,974 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:57:51,975 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:57:51,975 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723747862] [2019-10-13 17:57:51,980 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:57:51,980 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:57:51,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:57:51,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-13 17:57:51,998 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 5 states. [2019-10-13 17:57:54,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:57:54,185 INFO L93 Difference]: Finished difference Result 730 states and 1301 transitions. [2019-10-13 17:57:54,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:57:54,187 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2019-10-13 17:57:54,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:57:54,205 INFO L225 Difference]: With dead ends: 730 [2019-10-13 17:57:54,205 INFO L226 Difference]: Without dead ends: 447 [2019-10-13 17:57:54,213 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:57:54,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2019-10-13 17:57:54,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 441. [2019-10-13 17:57:54,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441 states. [2019-10-13 17:57:54,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 672 transitions. [2019-10-13 17:57:54,305 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 672 transitions. Word has length 37 [2019-10-13 17:57:54,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:57:54,306 INFO L462 AbstractCegarLoop]: Abstraction has 441 states and 672 transitions. [2019-10-13 17:57:54,306 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:57:54,306 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 672 transitions. [2019-10-13 17:57:54,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-10-13 17:57:54,322 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:57:54,323 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:57:54,323 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:57:54,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:57:54,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1761481729, now seen corresponding path program 1 times [2019-10-13 17:57:54,324 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:57:54,324 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617548691] [2019-10-13 17:57:54,325 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:54,325 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:54,325 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:57:54,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:54,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:54,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:54,806 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:57:54,806 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617548691] [2019-10-13 17:57:54,807 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983635641] [2019-10-13 17:57:54,807 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:57:54,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:54,889 INFO L256 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:57:54,902 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:57:54,992 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:57:54,993 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-13 17:57:54,993 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2019-10-13 17:57:54,994 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478582722] [2019-10-13 17:57:54,995 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:57:54,996 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:57:54,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:57:54,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:57:54,997 INFO L87 Difference]: Start difference. First operand 441 states and 672 transitions. Second operand 5 states. [2019-10-13 17:57:55,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:57:55,970 INFO L93 Difference]: Finished difference Result 1031 states and 1586 transitions. [2019-10-13 17:57:55,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:57:55,973 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 156 [2019-10-13 17:57:55,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:57:55,982 INFO L225 Difference]: With dead ends: 1031 [2019-10-13 17:57:55,982 INFO L226 Difference]: Without dead ends: 596 [2019-10-13 17:57:55,986 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:57:55,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2019-10-13 17:57:56,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 590. [2019-10-13 17:57:56,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 590 states. [2019-10-13 17:57:56,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 590 states to 590 states and 865 transitions. [2019-10-13 17:57:56,030 INFO L78 Accepts]: Start accepts. Automaton has 590 states and 865 transitions. Word has length 156 [2019-10-13 17:57:56,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:57:56,034 INFO L462 AbstractCegarLoop]: Abstraction has 590 states and 865 transitions. [2019-10-13 17:57:56,034 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:57:56,034 INFO L276 IsEmpty]: Start isEmpty. Operand 590 states and 865 transitions. [2019-10-13 17:57:56,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-10-13 17:57:56,039 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:57:56,039 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:57:56,240 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:57:56,241 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:57:56,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:57:56,242 INFO L82 PathProgramCache]: Analyzing trace with hash 630639194, now seen corresponding path program 1 times [2019-10-13 17:57:56,243 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:57:56,243 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419560335] [2019-10-13 17:57:56,243 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:56,243 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:56,243 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:57:56,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:56,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:56,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:56,617 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:57:56,618 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419560335] [2019-10-13 17:57:56,618 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:57:56,618 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2019-10-13 17:57:56,618 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423331078] [2019-10-13 17:57:56,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:57:56,631 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:57:56,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:57:56,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:57:56,632 INFO L87 Difference]: Start difference. First operand 590 states and 865 transitions. Second operand 9 states. [2019-10-13 17:57:58,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:57:58,756 INFO L93 Difference]: Finished difference Result 1939 states and 3010 transitions. [2019-10-13 17:57:58,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:57:58,758 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 163 [2019-10-13 17:57:58,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:57:58,775 INFO L225 Difference]: With dead ends: 1939 [2019-10-13 17:57:58,775 INFO L226 Difference]: Without dead ends: 1355 [2019-10-13 17:57:58,779 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:57:58,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1355 states. [2019-10-13 17:57:58,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1355 to 894. [2019-10-13 17:57:58,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 894 states. [2019-10-13 17:57:58,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 894 states to 894 states and 1190 transitions. [2019-10-13 17:57:58,858 INFO L78 Accepts]: Start accepts. Automaton has 894 states and 1190 transitions. Word has length 163 [2019-10-13 17:57:58,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:57:58,859 INFO L462 AbstractCegarLoop]: Abstraction has 894 states and 1190 transitions. [2019-10-13 17:57:58,860 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:57:58,860 INFO L276 IsEmpty]: Start isEmpty. Operand 894 states and 1190 transitions. [2019-10-13 17:57:58,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2019-10-13 17:57:58,873 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:57:58,873 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:57:58,874 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:57:58,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:57:58,875 INFO L82 PathProgramCache]: Analyzing trace with hash -545211835, now seen corresponding path program 1 times [2019-10-13 17:57:58,876 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:57:58,876 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319952964] [2019-10-13 17:57:58,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:58,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:57:58,877 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:57:58,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:59,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:59,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:59,528 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 127 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:57:59,529 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319952964] [2019-10-13 17:57:59,529 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455184144] [2019-10-13 17:57:59,529 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:57:59,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:57:59,614 INFO L256 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:57:59,622 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:57:59,673 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:57:59,746 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 128 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:57:59,746 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:57:59,746 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 15 [2019-10-13 17:57:59,747 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225850146] [2019-10-13 17:57:59,748 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:57:59,749 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:57:59,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:57:59,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:57:59,749 INFO L87 Difference]: Start difference. First operand 894 states and 1190 transitions. Second operand 15 states. [2019-10-13 17:58:04,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:58:04,525 INFO L93 Difference]: Finished difference Result 2114 states and 2917 transitions. [2019-10-13 17:58:04,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-13 17:58:04,525 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 226 [2019-10-13 17:58:04,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:58:04,536 INFO L225 Difference]: With dead ends: 2114 [2019-10-13 17:58:04,536 INFO L226 Difference]: Without dead ends: 1369 [2019-10-13 17:58:04,540 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=476, Invalid=1594, Unknown=0, NotChecked=0, Total=2070 [2019-10-13 17:58:04,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1369 states. [2019-10-13 17:58:04,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1369 to 1051. [2019-10-13 17:58:04,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1051 states. [2019-10-13 17:58:04,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1051 states to 1051 states and 1323 transitions. [2019-10-13 17:58:04,587 INFO L78 Accepts]: Start accepts. Automaton has 1051 states and 1323 transitions. Word has length 226 [2019-10-13 17:58:04,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:58:04,588 INFO L462 AbstractCegarLoop]: Abstraction has 1051 states and 1323 transitions. [2019-10-13 17:58:04,588 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:58:04,588 INFO L276 IsEmpty]: Start isEmpty. Operand 1051 states and 1323 transitions. [2019-10-13 17:58:04,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2019-10-13 17:58:04,592 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:58:04,593 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:58:04,797 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:04,798 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:58:04,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:58:04,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1220888374, now seen corresponding path program 1 times [2019-10-13 17:58:04,799 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:58:04,799 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735784932] [2019-10-13 17:58:04,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:04,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:04,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:58:04,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:04,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:04,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:04,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:05,087 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 136 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:58:05,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735784932] [2019-10-13 17:58:05,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032885228] [2019-10-13 17:58:05,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:05,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:05,180 INFO L256 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:58:05,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:58:05,256 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 137 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:58:05,257 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:58:05,257 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-10-13 17:58:05,257 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935116478] [2019-10-13 17:58:05,258 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:58:05,258 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:58:05,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:58:05,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:58:05,259 INFO L87 Difference]: Start difference. First operand 1051 states and 1323 transitions. Second operand 11 states. [2019-10-13 17:58:08,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:58:08,438 INFO L93 Difference]: Finished difference Result 3243 states and 4611 transitions. [2019-10-13 17:58:08,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:58:08,439 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 241 [2019-10-13 17:58:08,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:58:08,449 INFO L225 Difference]: With dead ends: 3243 [2019-10-13 17:58:08,450 INFO L226 Difference]: Without dead ends: 1258 [2019-10-13 17:58:08,458 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=268, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:58:08,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1258 states. [2019-10-13 17:58:08,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1258 to 1228. [2019-10-13 17:58:08,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1228 states. [2019-10-13 17:58:08,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1228 states to 1228 states and 1503 transitions. [2019-10-13 17:58:08,515 INFO L78 Accepts]: Start accepts. Automaton has 1228 states and 1503 transitions. Word has length 241 [2019-10-13 17:58:08,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:58:08,519 INFO L462 AbstractCegarLoop]: Abstraction has 1228 states and 1503 transitions. [2019-10-13 17:58:08,519 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:58:08,519 INFO L276 IsEmpty]: Start isEmpty. Operand 1228 states and 1503 transitions. [2019-10-13 17:58:08,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2019-10-13 17:58:08,524 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:58:08,525 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:58:08,728 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:08,729 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:58:08,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:58:08,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1555176578, now seen corresponding path program 1 times [2019-10-13 17:58:08,730 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:58:08,731 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296982259] [2019-10-13 17:58:08,731 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:08,731 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:08,732 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:58:08,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:08,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:08,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:08,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:09,001 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 60 proven. 90 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 17:58:09,002 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296982259] [2019-10-13 17:58:09,002 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027453718] [2019-10-13 17:58:09,002 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:09,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:09,092 INFO L256 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:58:09,096 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:58:09,193 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2019-10-13 17:58:09,195 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-13 17:58:09,195 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 11 [2019-10-13 17:58:09,195 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527288189] [2019-10-13 17:58:09,196 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:58:09,196 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:58:09,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:58:09,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:58:09,198 INFO L87 Difference]: Start difference. First operand 1228 states and 1503 transitions. Second operand 5 states. [2019-10-13 17:58:09,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:58:09,967 INFO L93 Difference]: Finished difference Result 2281 states and 2775 transitions. [2019-10-13 17:58:09,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:58:09,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 251 [2019-10-13 17:58:09,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:58:09,973 INFO L225 Difference]: With dead ends: 2281 [2019-10-13 17:58:09,973 INFO L226 Difference]: Without dead ends: 1218 [2019-10-13 17:58:09,978 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:58:09,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1218 states. [2019-10-13 17:58:10,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1218 to 1196. [2019-10-13 17:58:10,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1196 states. [2019-10-13 17:58:10,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1196 states to 1196 states and 1370 transitions. [2019-10-13 17:58:10,015 INFO L78 Accepts]: Start accepts. Automaton has 1196 states and 1370 transitions. Word has length 251 [2019-10-13 17:58:10,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:58:10,016 INFO L462 AbstractCegarLoop]: Abstraction has 1196 states and 1370 transitions. [2019-10-13 17:58:10,016 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:58:10,016 INFO L276 IsEmpty]: Start isEmpty. Operand 1196 states and 1370 transitions. [2019-10-13 17:58:10,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2019-10-13 17:58:10,025 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:58:10,026 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:58:10,239 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:10,239 INFO L410 AbstractCegarLoop]: === Iteration 7 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:58:10,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:58:10,240 INFO L82 PathProgramCache]: Analyzing trace with hash 677384141, now seen corresponding path program 1 times [2019-10-13 17:58:10,240 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:58:10,240 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675752324] [2019-10-13 17:58:10,240 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:10,240 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:58:10,240 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:58:10,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:10,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:10,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:10,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:10,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:11,340 INFO L134 CoverageAnalysis]: Checked inductivity of 359 backedges. 245 proven. 41 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2019-10-13 17:58:11,341 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675752324] [2019-10-13 17:58:11,341 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621498242] [2019-10-13 17:58:11,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:58:11,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:58:11,453 INFO L256 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:58:11,459 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:58:11,503 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,504 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,505 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,507 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,508 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,509 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,510 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:11,511 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:23,496 WARN L191 SmtUtils]: Spent 11.91 s on a formula simplification. DAG size of input: 49 DAG size of output: 36 [2019-10-13 17:58:23,574 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-10-13 17:58:23,688 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:58:23,908 INFO L134 CoverageAnalysis]: Checked inductivity of 359 backedges. 326 proven. 2 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2019-10-13 17:58:23,908 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:58:23,908 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8] total 24 [2019-10-13 17:58:23,909 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265902918] [2019-10-13 17:58:23,910 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-13 17:58:23,910 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:58:23,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-13 17:58:23,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:58:23,911 INFO L87 Difference]: Start difference. First operand 1196 states and 1370 transitions. Second operand 24 states. [2019-10-13 17:58:25,823 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 54