/usr/bin/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-177f698
[2020-08-21 19:05:19,882 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 19:05:19,885 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 19:05:19,926 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 19:05:19,927 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 19:05:19,936 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 19:05:19,939 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-08-21 19:05:19,951 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 19:05:19,954 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 19:05:19,957 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 19:05:19,958 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 19:05:19,960 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 19:05:19,961 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 19:05:19,962 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 19:05:19,972 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 19:05:19,974 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 19:05:19,975 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 19:05:19,976 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 19:05:19,977 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 19:05:19,989 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2020-08-21 19:05:19,990 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 19:05:19,995 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 19:05:19,995 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
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[2020-08-21 19:05:19,997 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-08-21 19:05:20,002 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
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[2020-08-21 19:05:20,007 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-21 19:05:20,008 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 19:05:20,009 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-21 19:05:20,032 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 19:05:20,032 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 19:05:20,033 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 19:05:20,034 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 19:05:20,034 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 19:05:20,034 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 19:05:20,034 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 19:05:20,035 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 19:05:20,036 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 19:05:20,036 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 19:05:20,036 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 19:05:20,036 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 19:05:20,036 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 19:05:20,037 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 19:05:20,037 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 19:05:20,037 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 19:05:20,037 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 19:05:20,038 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 19:05:20,038 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 19:05:20,038 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 19:05:20,038 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 19:05:20,038 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 19:05:20,038 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 19:05:20,039 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 19:05:20,039 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
[2020-08-21 19:05:20,318 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 19:05:20,331 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 19:05:20,335 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 19:05:20,336 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 19:05:20,337 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 19:05:20,337 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c
[2020-08-21 19:05:20,402 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5337c3698/dadb83a5da6743fab228b90997f6e4fe/FLAG74b674536
[2020-08-21 19:05:20,945 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 19:05:20,946 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c
[2020-08-21 19:05:20,955 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5337c3698/dadb83a5da6743fab228b90997f6e4fe/FLAG74b674536
[2020-08-21 19:05:21,268 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5337c3698/dadb83a5da6743fab228b90997f6e4fe
[2020-08-21 19:05:21,276 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 19:05:21,278 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 19:05:21,279 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 19:05:21,280 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 19:05:21,283 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 19:05:21,284 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,287 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f006d37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21, skipping insertion in model container
[2020-08-21 19:05:21,287 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,295 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 19:05:21,322 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 19:05:21,713 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 19:05:21,723 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 19:05:21,792 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 19:05:21,810 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 19:05:21,810 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21 WrapperNode
[2020-08-21 19:05:21,810 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 19:05:21,811 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 19:05:21,811 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 19:05:21,812 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 19:05:21,823 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,823 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,842 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,842 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,888 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,892 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,896 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
[2020-08-21 19:05:21,901 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 19:05:21,902 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 19:05:21,902 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 19:05:21,902 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 19:05:21,903 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 19:05:21,990 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 19:05:21,990 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 19:05:21,991 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 19:05:21,991 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 19:05:21,991 INFO  L130     BoogieDeclarations]: Found specification of procedure Id_MCDC_89
[2020-08-21 19:05:21,992 INFO  L130     BoogieDeclarations]: Found specification of procedure fopen
[2020-08-21 19:05:21,992 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 19:05:21,992 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-08-21 19:05:21,992 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-08-21 19:05:21,993 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-08-21 19:05:21,993 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-08-21 19:05:21,993 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2020-08-21 19:05:21,993 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-08-21 19:05:21,994 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 19:05:21,994 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 19:05:21,995 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-08-21 19:05:21,995 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-08-21 19:05:24,755 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 19:05:24,755 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 19:05:24,764 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:24 BoogieIcfgContainer
[2020-08-21 19:05:24,764 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 19:05:24,768 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 19:05:24,769 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 19:05:24,772 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 19:05:24,773 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:05:21" (1/3) ...
[2020-08-21 19:05:24,773 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c5cdbb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:24, skipping insertion in model container
[2020-08-21 19:05:24,774 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:21" (2/3) ...
[2020-08-21 19:05:24,775 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c5cdbb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:24, skipping insertion in model container
[2020-08-21 19:05:24,776 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:24" (3/3) ...
[2020-08-21 19:05:24,781 INFO  L109   eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+cfa-reducer.c
[2020-08-21 19:05:24,791 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 19:05:24,799 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 19:05:24,813 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 19:05:24,841 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 19:05:24,841 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 19:05:24,842 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 19:05:24,842 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 19:05:24,842 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 19:05:24,843 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 19:05:24,843 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 19:05:24,843 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 19:05:24,868 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states.
[2020-08-21 19:05:24,890 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-08-21 19:05:24,890 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:24,893 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:24,893 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:24,900 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:24,901 INFO  L82        PathProgramCache]: Analyzing trace with hash 316900320, now seen corresponding path program 1 times
[2020-08-21 19:05:24,910 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:24,911 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118511894]
[2020-08-21 19:05:24,911 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:25,112 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:25,284 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:25,288 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:25,300 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:25,301 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118511894]
[2020-08-21 19:05:25,303 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 19:05:25,304 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 19:05:25,305 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918825847]
[2020-08-21 19:05:25,310 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 19:05:25,310 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:25,324 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 19:05:25,325 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 19:05:25,327 INFO  L87              Difference]: Start difference. First operand 19 states. Second operand 5 states.
[2020-08-21 19:05:27,534 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:27,535 INFO  L93              Difference]: Finished difference Result 46 states and 56 transitions.
[2020-08-21 19:05:27,535 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-21 19:05:27,537 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-08-21 19:05:27,537 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:27,547 INFO  L225             Difference]: With dead ends: 46
[2020-08-21 19:05:27,547 INFO  L226             Difference]: Without dead ends: 24
[2020-08-21 19:05:27,551 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2020-08-21 19:05:27,568 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2020-08-21 19:05:27,587 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18.
[2020-08-21 19:05:27,589 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2020-08-21 19:05:27,589 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions.
[2020-08-21 19:05:27,591 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13
[2020-08-21 19:05:27,591 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:27,592 INFO  L479      AbstractCegarLoop]: Abstraction has 18 states and 19 transitions.
[2020-08-21 19:05:27,592 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 19:05:27,592 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions.
[2020-08-21 19:05:27,592 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-08-21 19:05:27,593 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:27,593 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:27,593 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 19:05:27,593 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:27,594 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:27,594 INFO  L82        PathProgramCache]: Analyzing trace with hash 316483246, now seen corresponding path program 1 times
[2020-08-21 19:05:27,594 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:27,594 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745481307]
[2020-08-21 19:05:27,595 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:27,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:27,697 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:27,700 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:27,707 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:27,708 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745481307]
[2020-08-21 19:05:27,708 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 19:05:27,708 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 19:05:27,709 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357924404]
[2020-08-21 19:05:27,710 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 19:05:27,711 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:27,711 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 19:05:27,711 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 19:05:27,711 INFO  L87              Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states.
[2020-08-21 19:05:29,844 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:29,844 INFO  L93              Difference]: Finished difference Result 28 states and 30 transitions.
[2020-08-21 19:05:29,847 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-21 19:05:29,847 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-08-21 19:05:29,847 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:29,849 INFO  L225             Difference]: With dead ends: 28
[2020-08-21 19:05:29,849 INFO  L226             Difference]: Without dead ends: 26
[2020-08-21 19:05:29,850 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 19:05:29,851 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 26 states.
[2020-08-21 19:05:29,856 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20.
[2020-08-21 19:05:29,857 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 20 states.
[2020-08-21 19:05:29,858 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions.
[2020-08-21 19:05:29,859 INFO  L78                 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13
[2020-08-21 19:05:29,859 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:29,860 INFO  L479      AbstractCegarLoop]: Abstraction has 20 states and 21 transitions.
[2020-08-21 19:05:29,860 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 19:05:29,860 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions.
[2020-08-21 19:05:29,861 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-08-21 19:05:29,862 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:29,863 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:29,863 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 19:05:29,864 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:29,864 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:29,864 INFO  L82        PathProgramCache]: Analyzing trace with hash 625969832, now seen corresponding path program 1 times
[2020-08-21 19:05:29,865 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:29,865 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254144274]
[2020-08-21 19:05:29,866 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:29,932 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:30,070 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:30,073 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:30,079 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:30,080 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254144274]
[2020-08-21 19:05:30,080 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:05:30,080 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6
[2020-08-21 19:05:30,081 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455100728]
[2020-08-21 19:05:30,081 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-21 19:05:30,082 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:30,082 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-21 19:05:30,082 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2020-08-21 19:05:30,083 INFO  L87              Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states.
[2020-08-21 19:05:34,309 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:34,309 INFO  L93              Difference]: Finished difference Result 40 states and 43 transitions.
[2020-08-21 19:05:34,310 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-08-21 19:05:34,310 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 19
[2020-08-21 19:05:34,310 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:34,311 INFO  L225             Difference]: With dead ends: 40
[2020-08-21 19:05:34,311 INFO  L226             Difference]: Without dead ends: 30
[2020-08-21 19:05:34,312 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72
[2020-08-21 19:05:34,313 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30 states.
[2020-08-21 19:05:34,318 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26.
[2020-08-21 19:05:34,319 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 26 states.
[2020-08-21 19:05:34,320 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions.
[2020-08-21 19:05:34,320 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19
[2020-08-21 19:05:34,320 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:34,321 INFO  L479      AbstractCegarLoop]: Abstraction has 26 states and 27 transitions.
[2020-08-21 19:05:34,321 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-21 19:05:34,321 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions.
[2020-08-21 19:05:34,322 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-08-21 19:05:34,322 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:34,322 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:34,322 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 19:05:34,323 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:34,323 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:34,323 INFO  L82        PathProgramCache]: Analyzing trace with hash 1878874992, now seen corresponding path program 2 times
[2020-08-21 19:05:34,324 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:34,324 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248154339]
[2020-08-21 19:05:34,324 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:34,409 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:34,566 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:34,569 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:34,579 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:34,580 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248154339]
[2020-08-21 19:05:34,581 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:05:34,581 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-08-21 19:05:34,581 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322786587]
[2020-08-21 19:05:34,582 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-08-21 19:05:34,583 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:34,583 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-08-21 19:05:34,584 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42
[2020-08-21 19:05:34,584 INFO  L87              Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 7 states.
[2020-08-21 19:05:40,830 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:40,830 INFO  L93              Difference]: Finished difference Result 46 states and 49 transitions.
[2020-08-21 19:05:40,830 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-08-21 19:05:40,831 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 25
[2020-08-21 19:05:40,831 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:40,832 INFO  L225             Difference]: With dead ends: 46
[2020-08-21 19:05:40,832 INFO  L226             Difference]: Without dead ends: 36
[2020-08-21 19:05:40,833 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-08-21 19:05:40,833 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2020-08-21 19:05:40,838 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32.
[2020-08-21 19:05:40,839 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 32 states.
[2020-08-21 19:05:40,840 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions.
[2020-08-21 19:05:40,840 INFO  L78                 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 25
[2020-08-21 19:05:40,840 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:40,841 INFO  L479      AbstractCegarLoop]: Abstraction has 32 states and 33 transitions.
[2020-08-21 19:05:40,841 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-08-21 19:05:40,841 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions.
[2020-08-21 19:05:40,842 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-08-21 19:05:40,842 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:40,842 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:40,842 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 19:05:40,843 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:40,843 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:40,843 INFO  L82        PathProgramCache]: Analyzing trace with hash -1460832712, now seen corresponding path program 3 times
[2020-08-21 19:05:40,843 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:40,844 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088088237]
[2020-08-21 19:05:40,844 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:40,873 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:41,022 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:41,023 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:41,029 INFO  L134       CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:41,030 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088088237]
[2020-08-21 19:05:41,030 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:05:41,030 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2020-08-21 19:05:41,031 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561757338]
[2020-08-21 19:05:41,031 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-08-21 19:05:41,031 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:41,032 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-08-21 19:05:41,032 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56
[2020-08-21 19:05:41,032 INFO  L87              Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 8 states.
[2020-08-21 19:05:49,329 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:49,329 INFO  L93              Difference]: Finished difference Result 52 states and 55 transitions.
[2020-08-21 19:05:49,330 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-08-21 19:05:49,330 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 31
[2020-08-21 19:05:49,331 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:49,332 INFO  L225             Difference]: With dead ends: 52
[2020-08-21 19:05:49,332 INFO  L226             Difference]: Without dead ends: 42
[2020-08-21 19:05:49,333 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156
[2020-08-21 19:05:49,333 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 42 states.
[2020-08-21 19:05:49,341 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38.
[2020-08-21 19:05:49,342 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 38 states.
[2020-08-21 19:05:49,343 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions.
[2020-08-21 19:05:49,343 INFO  L78                 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 31
[2020-08-21 19:05:49,344 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:49,344 INFO  L479      AbstractCegarLoop]: Abstraction has 38 states and 39 transitions.
[2020-08-21 19:05:49,344 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-08-21 19:05:49,344 INFO  L276                IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions.
[2020-08-21 19:05:49,345 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2020-08-21 19:05:49,345 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:49,345 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:49,346 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 19:05:49,346 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:49,346 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:49,346 INFO  L82        PathProgramCache]: Analyzing trace with hash 599808768, now seen corresponding path program 4 times
[2020-08-21 19:05:49,347 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:49,347 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880554000]
[2020-08-21 19:05:49,347 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:49,402 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:49,542 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:05:49,544 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:05:49,551 INFO  L134       CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:05:49,551 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880554000]
[2020-08-21 19:05:49,551 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:05:49,552 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-21 19:05:49,552 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642748133]
[2020-08-21 19:05:49,552 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-21 19:05:49,553 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:05:49,553 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-21 19:05:49,553 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72
[2020-08-21 19:05:49,553 INFO  L87              Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 9 states.
[2020-08-21 19:05:59,911 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:05:59,912 INFO  L93              Difference]: Finished difference Result 58 states and 61 transitions.
[2020-08-21 19:05:59,912 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-21 19:05:59,913 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 37
[2020-08-21 19:05:59,913 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:05:59,914 INFO  L225             Difference]: With dead ends: 58
[2020-08-21 19:05:59,914 INFO  L226             Difference]: Without dead ends: 48
[2020-08-21 19:05:59,916 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210
[2020-08-21 19:05:59,916 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 48 states.
[2020-08-21 19:05:59,922 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44.
[2020-08-21 19:05:59,923 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 44 states.
[2020-08-21 19:05:59,924 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions.
[2020-08-21 19:05:59,924 INFO  L78                 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 37
[2020-08-21 19:05:59,924 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:05:59,924 INFO  L479      AbstractCegarLoop]: Abstraction has 44 states and 45 transitions.
[2020-08-21 19:05:59,925 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-21 19:05:59,925 INFO  L276                IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions.
[2020-08-21 19:05:59,926 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 44
[2020-08-21 19:05:59,926 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:05:59,926 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:05:59,926 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 19:05:59,927 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:05:59,927 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:05:59,927 INFO  L82        PathProgramCache]: Analyzing trace with hash 431393224, now seen corresponding path program 5 times
[2020-08-21 19:05:59,927 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:05:59,927 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475535197]
[2020-08-21 19:05:59,928 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:05:59,960 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:00,147 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:06:00,148 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:00,161 INFO  L134       CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:06:00,162 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475535197]
[2020-08-21 19:06:00,162 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:06:00,162 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-08-21 19:06:00,163 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607970135]
[2020-08-21 19:06:00,163 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-08-21 19:06:00,163 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:06:00,163 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-08-21 19:06:00,164 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90
[2020-08-21 19:06:00,164 INFO  L87              Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 10 states.
[2020-08-21 19:06:12,575 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:06:12,576 INFO  L93              Difference]: Finished difference Result 64 states and 67 transitions.
[2020-08-21 19:06:12,578 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-08-21 19:06:12,578 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 43
[2020-08-21 19:06:12,578 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:06:12,579 INFO  L225             Difference]: With dead ends: 64
[2020-08-21 19:06:12,580 INFO  L226             Difference]: Without dead ends: 54
[2020-08-21 19:06:12,580 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272
[2020-08-21 19:06:12,581 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 54 states.
[2020-08-21 19:06:12,594 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50.
[2020-08-21 19:06:12,594 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 50 states.
[2020-08-21 19:06:12,597 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions.
[2020-08-21 19:06:12,598 INFO  L78                 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 43
[2020-08-21 19:06:12,599 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:06:12,599 INFO  L479      AbstractCegarLoop]: Abstraction has 50 states and 51 transitions.
[2020-08-21 19:06:12,599 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-08-21 19:06:12,600 INFO  L276                IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions.
[2020-08-21 19:06:12,602 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 50
[2020-08-21 19:06:12,602 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:06:12,605 INFO  L422         BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:06:12,605 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-08-21 19:06:12,605 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:06:12,605 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:06:12,606 INFO  L82        PathProgramCache]: Analyzing trace with hash -240090480, now seen corresponding path program 6 times
[2020-08-21 19:06:12,606 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:06:12,606 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775737144]
[2020-08-21 19:06:12,606 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:06:12,665 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:12,859 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:06:12,861 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:12,869 INFO  L134       CoverageAnalysis]: Checked inductivity of 120 backedges. 12 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:06:12,870 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775737144]
[2020-08-21 19:06:12,870 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:06:12,870 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-08-21 19:06:12,870 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656753095]
[2020-08-21 19:06:12,871 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-21 19:06:12,871 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:06:12,871 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-21 19:06:12,872 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110
[2020-08-21 19:06:12,872 INFO  L87              Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 11 states.
[2020-08-21 19:06:27,392 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 19:06:27,393 INFO  L93              Difference]: Finished difference Result 70 states and 73 transitions.
[2020-08-21 19:06:27,393 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-21 19:06:27,393 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 49
[2020-08-21 19:06:27,394 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 19:06:27,395 INFO  L225             Difference]: With dead ends: 70
[2020-08-21 19:06:27,395 INFO  L226             Difference]: Without dead ends: 60
[2020-08-21 19:06:27,396 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342
[2020-08-21 19:06:27,397 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 60 states.
[2020-08-21 19:06:27,404 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56.
[2020-08-21 19:06:27,405 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 56 states.
[2020-08-21 19:06:27,406 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions.
[2020-08-21 19:06:27,406 INFO  L78                 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 49
[2020-08-21 19:06:27,406 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 19:06:27,406 INFO  L479      AbstractCegarLoop]: Abstraction has 56 states and 57 transitions.
[2020-08-21 19:06:27,407 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-21 19:06:27,420 INFO  L276                IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions.
[2020-08-21 19:06:27,421 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 56
[2020-08-21 19:06:27,421 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 19:06:27,421 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 19:06:27,421 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-08-21 19:06:27,422 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 19:06:27,422 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 19:06:27,422 INFO  L82        PathProgramCache]: Analyzing trace with hash -2010200744, now seen corresponding path program 7 times
[2020-08-21 19:06:27,422 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 19:06:27,423 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047709017]
[2020-08-21 19:06:27,423 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 19:06:27,453 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:27,657 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 19:06:27,659 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 19:06:27,670 INFO  L134       CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 19:06:27,671 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047709017]
[2020-08-21 19:06:27,671 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-21 19:06:27,671 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12
[2020-08-21 19:06:27,672 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722859907]
[2020-08-21 19:06:27,672 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-08-21 19:06:27,672 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 19:06:27,673 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-08-21 19:06:27,673 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132
[2020-08-21 19:06:27,673 INFO  L87              Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 12 states.