./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/ms1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7e1ff0e6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-fpi/ms1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f19b0f8887e7e48eabb6ce59c44b5494c064f6817a5ff1a77078d9e3a8f8600e --- Real Ultimate output --- This is Ultimate 0.2.2-?-7e1ff0e [2023-02-14 22:13:39,245 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-02-14 22:13:39,247 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-02-14 22:13:39,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-02-14 22:13:39,279 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-02-14 22:13:39,282 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-02-14 22:13:39,283 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-02-14 22:13:39,285 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-02-14 22:13:39,287 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-02-14 22:13:39,291 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-02-14 22:13:39,292 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-02-14 22:13:39,293 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-02-14 22:13:39,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-02-14 22:13:39,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-02-14 22:13:39,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-02-14 22:13:39,297 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-02-14 22:13:39,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-02-14 22:13:39,299 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-02-14 22:13:39,300 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-02-14 22:13:39,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-02-14 22:13:39,304 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-02-14 22:13:39,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-02-14 22:13:39,305 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-02-14 22:13:39,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-02-14 22:13:39,311 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-02-14 22:13:39,312 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-02-14 22:13:39,312 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-02-14 22:13:39,313 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-02-14 22:13:39,314 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-02-14 22:13:39,314 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-02-14 22:13:39,314 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-02-14 22:13:39,315 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-02-14 22:13:39,316 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-02-14 22:13:39,316 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-02-14 22:13:39,317 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-02-14 22:13:39,318 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-02-14 22:13:39,318 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-02-14 22:13:39,318 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-02-14 22:13:39,319 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-02-14 22:13:39,319 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-02-14 22:13:39,320 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-02-14 22:13:39,321 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-02-14 22:13:39,348 INFO L113 SettingsManager]: Loading preferences was successful [2023-02-14 22:13:39,348 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-02-14 22:13:39,348 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-02-14 22:13:39,348 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-02-14 22:13:39,349 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-02-14 22:13:39,349 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-02-14 22:13:39,350 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-02-14 22:13:39,350 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-02-14 22:13:39,350 INFO L138 SettingsManager]: * Use SBE=true [2023-02-14 22:13:39,350 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-02-14 22:13:39,351 INFO L138 SettingsManager]: * sizeof long=4 [2023-02-14 22:13:39,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-02-14 22:13:39,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-02-14 22:13:39,351 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-02-14 22:13:39,351 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * sizeof long double=12 [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * Use constant arrays=true [2023-02-14 22:13:39,352 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-02-14 22:13:39,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-02-14 22:13:39,353 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-02-14 22:13:39,353 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-02-14 22:13:39,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-14 22:13:39,353 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-02-14 22:13:39,353 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-02-14 22:13:39,353 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-02-14 22:13:39,354 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-02-14 22:13:39,355 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-02-14 22:13:39,355 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f19b0f8887e7e48eabb6ce59c44b5494c064f6817a5ff1a77078d9e3a8f8600e [2023-02-14 22:13:39,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-02-14 22:13:39,548 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-02-14 22:13:39,550 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-02-14 22:13:39,551 INFO L271 PluginConnector]: Initializing CDTParser... [2023-02-14 22:13:39,551 INFO L275 PluginConnector]: CDTParser initialized [2023-02-14 22:13:39,552 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ms1.c [2023-02-14 22:13:40,482 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-02-14 22:13:40,671 INFO L351 CDTParser]: Found 1 translation units. [2023-02-14 22:13:40,672 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms1.c [2023-02-14 22:13:40,675 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a20e7dc28/dbf30882be8e448298b5b3d460b875a8/FLAGfbe07edb2 [2023-02-14 22:13:40,696 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a20e7dc28/dbf30882be8e448298b5b3d460b875a8 [2023-02-14 22:13:40,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-02-14 22:13:40,699 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-02-14 22:13:40,700 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-02-14 22:13:40,700 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-02-14 22:13:40,702 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-02-14 22:13:40,703 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,703 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60fd525d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40, skipping insertion in model container [2023-02-14 22:13:40,703 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,708 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-02-14 22:13:40,718 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-02-14 22:13:40,801 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms1.c[586,599] [2023-02-14 22:13:40,814 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-14 22:13:40,822 INFO L203 MainTranslator]: Completed pre-run [2023-02-14 22:13:40,831 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ms1.c[586,599] [2023-02-14 22:13:40,835 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-14 22:13:40,843 INFO L208 MainTranslator]: Completed translation [2023-02-14 22:13:40,843 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40 WrapperNode [2023-02-14 22:13:40,843 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-02-14 22:13:40,844 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-02-14 22:13:40,844 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-02-14 22:13:40,844 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-02-14 22:13:40,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,852 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,872 INFO L138 Inliner]: procedures = 17, calls = 25, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 70 [2023-02-14 22:13:40,872 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-02-14 22:13:40,873 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-02-14 22:13:40,873 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-02-14 22:13:40,873 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-02-14 22:13:40,879 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,879 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,881 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,884 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,886 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,888 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,889 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-02-14 22:13:40,891 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-02-14 22:13:40,891 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-02-14 22:13:40,891 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-02-14 22:13:40,891 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (1/1) ... [2023-02-14 22:13:40,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-14 22:13:40,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-14 22:13:40,918 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-02-14 22:13:40,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-02-14 22:13:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-02-14 22:13:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-02-14 22:13:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-02-14 22:13:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-02-14 22:13:40,944 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-02-14 22:13:40,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-02-14 22:13:40,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-02-14 22:13:40,945 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-02-14 22:13:40,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-02-14 22:13:40,988 INFO L235 CfgBuilder]: Building ICFG [2023-02-14 22:13:40,989 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2023-02-14 22:13:41,085 INFO L276 CfgBuilder]: Performing block encoding [2023-02-14 22:13:41,102 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-02-14 22:13:41,103 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2023-02-14 22:13:41,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.02 10:13:41 BoogieIcfgContainer [2023-02-14 22:13:41,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-02-14 22:13:41,121 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-02-14 22:13:41,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-02-14 22:13:41,123 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-02-14 22:13:41,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.02 10:13:40" (1/3) ... [2023-02-14 22:13:41,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c6a22c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.02 10:13:41, skipping insertion in model container [2023-02-14 22:13:41,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 10:13:40" (2/3) ... [2023-02-14 22:13:41,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c6a22c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.02 10:13:41, skipping insertion in model container [2023-02-14 22:13:41,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.02 10:13:41" (3/3) ... [2023-02-14 22:13:41,128 INFO L112 eAbstractionObserver]: Analyzing ICFG ms1.c [2023-02-14 22:13:41,141 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-02-14 22:13:41,142 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-02-14 22:13:41,185 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-02-14 22:13:41,190 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7c428b37, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-02-14 22:13:41,190 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-02-14 22:13:41,193 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-02-14 22:13:41,196 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:41,196 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:41,197 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:41,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:41,200 INFO L85 PathProgramCache]: Analyzing trace with hash 356661439, now seen corresponding path program 1 times [2023-02-14 22:13:41,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:41,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970559520] [2023-02-14 22:13:41,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:41,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:41,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:41,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:41,304 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:41,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970559520] [2023-02-14 22:13:41,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970559520] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-14 22:13:41,305 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-14 22:13:41,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-02-14 22:13:41,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159207125] [2023-02-14 22:13:41,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-14 22:13:41,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-02-14 22:13:41,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:41,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-02-14 22:13:41,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-02-14 22:13:41,327 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:41,336 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2023-02-14 22:13:41,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-02-14 22:13:41,337 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-02-14 22:13:41,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:41,341 INFO L225 Difference]: With dead ends: 34 [2023-02-14 22:13:41,341 INFO L226 Difference]: Without dead ends: 15 [2023-02-14 22:13:41,343 INFO L412 NwaCegarLoop]: 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 [2023-02-14 22:13:41,345 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:41,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-14 22:13:41,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-02-14 22:13:41,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-02-14 22:13:41,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2023-02-14 22:13:41,363 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2023-02-14 22:13:41,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:41,363 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2023-02-14 22:13:41,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,364 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2023-02-14 22:13:41,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-02-14 22:13:41,364 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:41,364 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:41,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-02-14 22:13:41,365 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:41,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:41,365 INFO L85 PathProgramCache]: Analyzing trace with hash -452685187, now seen corresponding path program 1 times [2023-02-14 22:13:41,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:41,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141314178] [2023-02-14 22:13:41,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:41,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:41,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:41,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:41,456 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:41,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141314178] [2023-02-14 22:13:41,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141314178] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-14 22:13:41,457 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-14 22:13:41,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-14 22:13:41,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883570559] [2023-02-14 22:13:41,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-14 22:13:41,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-02-14 22:13:41,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:41,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-02-14 22:13:41,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-02-14 22:13:41,459 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:41,489 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2023-02-14 22:13:41,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-02-14 22:13:41,489 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-02-14 22:13:41,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:41,490 INFO L225 Difference]: With dead ends: 28 [2023-02-14 22:13:41,490 INFO L226 Difference]: Without dead ends: 20 [2023-02-14 22:13:41,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-02-14 22:13:41,491 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:41,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 13 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-14 22:13:41,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-02-14 22:13:41,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2023-02-14 22:13:41,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-02-14 22:13:41,495 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 11 [2023-02-14 22:13:41,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:41,495 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-02-14 22:13:41,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,495 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-02-14 22:13:41,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-02-14 22:13:41,496 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:41,496 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:41,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-02-14 22:13:41,496 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:41,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:41,497 INFO L85 PathProgramCache]: Analyzing trace with hash 623611495, now seen corresponding path program 1 times [2023-02-14 22:13:41,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:41,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924531407] [2023-02-14 22:13:41,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:41,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:41,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:41,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-02-14 22:13:41,706 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:41,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924531407] [2023-02-14 22:13:41,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924531407] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-14 22:13:41,707 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-14 22:13:41,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-14 22:13:41,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449257866] [2023-02-14 22:13:41,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-14 22:13:41,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-02-14 22:13:41,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:41,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-02-14 22:13:41,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-02-14 22:13:41,709 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:41,731 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2023-02-14 22:13:41,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-02-14 22:13:41,731 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-02-14 22:13:41,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:41,732 INFO L225 Difference]: With dead ends: 25 [2023-02-14 22:13:41,732 INFO L226 Difference]: Without dead ends: 21 [2023-02-14 22:13:41,732 INFO L412 NwaCegarLoop]: 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 [2023-02-14 22:13:41,733 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:41,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 41 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-14 22:13:41,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-02-14 22:13:41,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-02-14 22:13:41,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-02-14 22:13:41,737 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2023-02-14 22:13:41,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:41,737 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-02-14 22:13:41,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:41,738 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-02-14 22:13:41,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-02-14 22:13:41,738 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:41,738 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:41,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-02-14 22:13:41,739 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:41,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:41,739 INFO L85 PathProgramCache]: Analyzing trace with hash -422196611, now seen corresponding path program 1 times [2023-02-14 22:13:41,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:41,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251485967] [2023-02-14 22:13:41,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:41,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:41,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:41,843 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:41,843 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:41,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251485967] [2023-02-14 22:13:41,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251485967] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-14 22:13:41,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031925629] [2023-02-14 22:13:41,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:41,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:41,844 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-14 22:13:41,847 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-02-14 22:13:41,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-02-14 22:13:41,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:41,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2023-02-14 22:13:41,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-14 22:13:41,988 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:41,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-14 22:13:42,044 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:42,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031925629] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-14 22:13:42,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-14 22:13:42,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-02-14 22:13:42,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531506151] [2023-02-14 22:13:42,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-14 22:13:42,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-02-14 22:13:42,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:42,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-02-14 22:13:42,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2023-02-14 22:13:42,053 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:42,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:42,124 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2023-02-14 22:13:42,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-02-14 22:13:42,125 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-02-14 22:13:42,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:42,127 INFO L225 Difference]: With dead ends: 39 [2023-02-14 22:13:42,127 INFO L226 Difference]: Without dead ends: 25 [2023-02-14 22:13:42,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2023-02-14 22:13:42,137 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:42,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 28 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-14 22:13:42,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-02-14 22:13:42,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2023-02-14 22:13:42,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:42,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-02-14 22:13:42,140 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2023-02-14 22:13:42,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:42,140 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-02-14 22:13:42,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:42,141 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-02-14 22:13:42,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-02-14 22:13:42,141 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:42,141 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:42,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-02-14 22:13:42,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:42,357 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:42,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:42,358 INFO L85 PathProgramCache]: Analyzing trace with hash 692240447, now seen corresponding path program 2 times [2023-02-14 22:13:42,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:42,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167122143] [2023-02-14 22:13:42,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:42,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:42,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:42,839 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:42,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:42,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167122143] [2023-02-14 22:13:42,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167122143] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-14 22:13:42,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858858834] [2023-02-14 22:13:42,840 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-02-14 22:13:42,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:42,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-14 22:13:42,860 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-02-14 22:13:42,861 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-02-14 22:13:42,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-02-14 22:13:42,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-14 22:13:42,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 37 conjunts are in the unsatisfiable core [2023-02-14 22:13:42,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-14 22:13:43,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-02-14 22:13:43,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-14 22:13:43,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-02-14 22:13:43,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-14 22:13:43,246 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2023-02-14 22:13:43,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 36 [2023-02-14 22:13:43,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-14 22:13:43,442 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2023-02-14 22:13:43,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 26 [2023-02-14 22:13:43,456 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:43,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-14 22:13:45,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 46 [2023-02-14 22:13:45,827 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:45,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858858834] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-14 22:13:45,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-14 22:13:45,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14] total 33 [2023-02-14 22:13:45,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559567431] [2023-02-14 22:13:45,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-14 22:13:45,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-02-14 22:13:45,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:45,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-02-14 22:13:45,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=897, Unknown=1, NotChecked=0, Total=1056 [2023-02-14 22:13:45,833 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 33 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:46,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:46,577 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2023-02-14 22:13:46,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-02-14 22:13:46,577 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 33 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-02-14 22:13:46,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:46,578 INFO L225 Difference]: With dead ends: 38 [2023-02-14 22:13:46,578 INFO L226 Difference]: Without dead ends: 27 [2023-02-14 22:13:46,578 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=343, Invalid=1548, Unknown=1, NotChecked=0, Total=1892 [2023-02-14 22:13:46,579 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 102 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:46,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 51 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-02-14 22:13:46,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-02-14 22:13:46,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2023-02-14 22:13:46,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:46,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2023-02-14 22:13:46,583 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2023-02-14 22:13:46,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:46,583 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2023-02-14 22:13:46,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 33 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:46,583 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2023-02-14 22:13:46,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-02-14 22:13:46,584 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:46,584 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:46,590 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-02-14 22:13:46,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:46,788 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:46,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:46,789 INFO L85 PathProgramCache]: Analyzing trace with hash -301520475, now seen corresponding path program 3 times [2023-02-14 22:13:46,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:46,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309214935] [2023-02-14 22:13:46,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:46,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:46,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:46,892 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:46,892 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:46,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309214935] [2023-02-14 22:13:46,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309214935] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-14 22:13:46,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205257334] [2023-02-14 22:13:46,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-02-14 22:13:46,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:46,893 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-14 22:13:46,894 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-02-14 22:13:46,896 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-02-14 22:13:46,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-02-14 22:13:46,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-14 22:13:46,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2023-02-14 22:13:46,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-14 22:13:46,988 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:46,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-14 22:13:47,029 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:47,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205257334] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-14 22:13:47,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-14 22:13:47,029 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-02-14 22:13:47,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425261677] [2023-02-14 22:13:47,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-14 22:13:47,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-02-14 22:13:47,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-14 22:13:47,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-02-14 22:13:47,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2023-02-14 22:13:47,031 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:47,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-14 22:13:47,096 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2023-02-14 22:13:47,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-02-14 22:13:47,097 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2023-02-14 22:13:47,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-14 22:13:47,097 INFO L225 Difference]: With dead ends: 50 [2023-02-14 22:13:47,097 INFO L226 Difference]: Without dead ends: 30 [2023-02-14 22:13:47,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2023-02-14 22:13:47,098 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 16 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-14 22:13:47,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 48 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-14 22:13:47,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-02-14 22:13:47,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2023-02-14 22:13:47,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:47,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2023-02-14 22:13:47,102 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2023-02-14 22:13:47,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-14 22:13:47,103 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2023-02-14 22:13:47,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-14 22:13:47,103 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2023-02-14 22:13:47,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-02-14 22:13:47,103 INFO L187 NwaCegarLoop]: Found error trace [2023-02-14 22:13:47,103 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-14 22:13:47,121 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-02-14 22:13:47,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:47,308 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-14 22:13:47,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-14 22:13:47,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1384678109, now seen corresponding path program 4 times [2023-02-14 22:13:47,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-14 22:13:47,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119443203] [2023-02-14 22:13:47,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-14 22:13:47,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-14 22:13:47,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-14 22:13:47,860 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-14 22:13:47,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-14 22:13:47,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119443203] [2023-02-14 22:13:47,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119443203] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-14 22:13:47,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356722958] [2023-02-14 22:13:47,861 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-02-14 22:13:47,861 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-14 22:13:47,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-14 22:13:47,869 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-02-14 22:13:47,926 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-02-14 22:13:47,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-02-14 22:13:47,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-14 22:13:47,936 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 43 conjunts are in the unsatisfiable core [2023-02-14 22:13:47,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-14 22:13:47,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-02-14 22:13:47,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2023-02-14 22:13:52,119 INFO L321 Elim1Store]: treesize reduction 77, result has 23.8 percent of original size [2023-02-14 22:13:52,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2023-02-14 22:13:52,246 INFO L321 Elim1Store]: treesize reduction 153, result has 33.5 percent of original size [2023-02-14 22:13:52,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 56 treesize of output 95 [2023-02-14 22:13:52,786 INFO L321 Elim1Store]: treesize reduction 491, result has 27.2 percent of original size [2023-02-14 22:13:52,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 27 case distinctions, treesize of input 201 treesize of output 303 [2023-02-14 22:15:05,614 WARN L233 SmtUtils]: Spent 1.17m on a formula simplification. DAG size of input: 301 DAG size of output: 190 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-02-14 22:15:28,589 WARN L233 SmtUtils]: Spent 20.38s on a formula simplification that was a NOOP. DAG size: 190 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-02-14 22:15:57,557 WARN L233 SmtUtils]: Spent 22.40s on a formula simplification. DAG size of input: 101 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-02-14 22:15:58,193 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-14 22:15:58,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 235 treesize of output 1110