/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCInlineTransformed.xml -s ../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_BvToInt_SUM.epf -i ../../../trunk/examples/svcomp/array-tiling/rewnifrev.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-a10ec3b [2022-01-11 03:06:28,082 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-11 03:06:28,084 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-11 03:06:28,148 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-01-11 03:06:28,154 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-01-11 03:06:28,157 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-01-11 03:06:28,160 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-01-11 03:06:28,163 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-01-11 03:06:28,165 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-01-11 03:06:28,170 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-01-11 03:06:28,170 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-01-11 03:06:28,171 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-01-11 03:06:28,171 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-11 03:06:28,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-11 03:06:28,173 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-11 03:06:28,173 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-11 03:06:28,174 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-11 03:06:28,175 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-11 03:06:28,176 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-11 03:06:28,177 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-11 03:06:28,178 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-11 03:06:28,181 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-11 03:06:28,182 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-11 03:06:28,183 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-11 03:06:28,185 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-01-11 03:06:28,185 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-01-11 03:06:28,185 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-01-11 03:06:28,186 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-01-11 03:06:28,186 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-01-11 03:06:28,187 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2022-01-11 03:06:28,190 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-11 03:06:28,191 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-11 03:06:28,192 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-11 03:06:28,197 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_BvToInt_SUM.epf [2022-01-11 03:06:28,234 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-11 03:06:28,234 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-11 03:06:28,234 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-11 03:06:28,234 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-11 03:06:28,235 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-11 03:06:28,235 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-11 03:06:28,235 INFO L138 SettingsManager]: * Use SBE=true [2022-01-11 03:06:28,236 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-01-11 03:06:28,236 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-11 03:06:28,237 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-11 03:06:28,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-11 03:06:28,237 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-01-11 03:06:28,238 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-01-11 03:06:28,239 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-01-11 03:06:28,239 INFO L138 SettingsManager]: * TransformationType=BV_TO_INT_SUM 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-11 03:06:28,442 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-11 03:06:28,459 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-11 03:06:28,460 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-11 03:06:28,461 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-11 03:06:28,463 INFO L275 PluginConnector]: CDTParser initialized [2022-01-11 03:06:28,464 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/rewnifrev.c [2022-01-11 03:06:28,505 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24c570512/0d6b720a461e446a9b267cd00694119c/FLAG05cdcb1b7 [2022-01-11 03:06:28,820 INFO L306 CDTParser]: Found 1 translation units. [2022-01-11 03:06:28,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev.c [2022-01-11 03:06:28,825 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24c570512/0d6b720a461e446a9b267cd00694119c/FLAG05cdcb1b7 [2022-01-11 03:06:29,245 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24c570512/0d6b720a461e446a9b267cd00694119c [2022-01-11 03:06:29,247 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-11 03:06:29,250 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-01-11 03:06:29,253 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-11 03:06:29,253 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-11 03:06:29,255 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-11 03:06:29,256 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@df89bd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29, skipping insertion in model container [2022-01-11 03:06:29,258 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,263 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-11 03:06:29,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-11 03:06:29,394 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev.c[400,413] [2022-01-11 03:06:29,415 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-11 03:06:29,427 INFO L203 MainTranslator]: Completed pre-run [2022-01-11 03:06:29,440 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev.c[400,413] [2022-01-11 03:06:29,450 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-11 03:06:29,469 INFO L208 MainTranslator]: Completed translation [2022-01-11 03:06:29,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29 WrapperNode [2022-01-11 03:06:29,469 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-11 03:06:29,470 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-01-11 03:06:29,470 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-01-11 03:06:29,470 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-01-11 03:06:29,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,483 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,508 INFO L137 Inliner]: procedures = 18, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-01-11 03:06:29,508 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-01-11 03:06:29,509 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-11 03:06:29,509 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-11 03:06:29,509 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-11 03:06:29,516 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,529 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,530 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,537 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,540 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,555 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-11 03:06:29,556 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-11 03:06:29,556 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-11 03:06:29,556 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-11 03:06:29,558 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,564 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-11 03:06:29,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-11 03:06:29,588 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) [2022-01-11 03:06:29,611 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 [2022-01-11 03:06:29,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-11 03:06:29,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-01-11 03:06:29,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-01-11 03:06:29,629 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-01-11 03:06:29,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-11 03:06:29,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-11 03:06:29,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-01-11 03:06:29,689 INFO L234 CfgBuilder]: Building ICFG [2022-01-11 03:06:29,690 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-11 03:06:29,831 INFO L275 CfgBuilder]: Performing block encoding [2022-01-11 03:06:29,852 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-11 03:06:29,852 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-11 03:06:29,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 03:06:29 BoogieIcfgContainer [2022-01-11 03:06:29,855 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-11 03:06:29,859 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-01-11 03:06:29,859 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-01-11 03:06:29,860 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-01-11 03:06:29,862 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 03:06:29" (1/1) ... [2022-01-11 03:06:29,961 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 11.01 03:06:29 BasicIcfg [2022-01-11 03:06:29,962 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-01-11 03:06:29,963 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-11 03:06:29,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-11 03:06:29,966 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-11 03:06:29,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.01 03:06:29" (1/4) ... [2022-01-11 03:06:29,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ef829ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.01 03:06:29, skipping insertion in model container [2022-01-11 03:06:29,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.01 03:06:29" (2/4) ... [2022-01-11 03:06:29,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ef829ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.01 03:06:29, skipping insertion in model container [2022-01-11 03:06:29,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.01 03:06:29" (3/4) ... [2022-01-11 03:06:29,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ef829ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.01 03:06:29, skipping insertion in model container [2022-01-11 03:06:29,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 11.01 03:06:29" (4/4) ... [2022-01-11 03:06:29,968 INFO L111 eAbstractionObserver]: Analyzing ICFG rewnifrev.cTransformedIcfg [2022-01-11 03:06:29,972 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-11 03:06:29,972 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-11 03:06:30,024 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-11 03:06:30,035 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2022-01-11 03:06:30,035 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-11 03:06:30,047 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) [2022-01-11 03:06:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-01-11 03:06:30,051 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 03:06:30,052 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-01-11 03:06:30,052 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 03:06:30,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 03:06:30,061 INFO L85 PathProgramCache]: Analyzing trace with hash 431554477, now seen corresponding path program 1 times [2022-01-11 03:06:30,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 03:06:30,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984321426] [2022-01-11 03:06:30,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:30,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 03:06:30,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:30,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:30,255 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 03:06:30,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984321426] [2022-01-11 03:06:30,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984321426] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-11 03:06:30,256 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-11 03:06:30,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-01-11 03:06:30,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370285722] [2022-01-11 03:06:30,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-11 03:06:30,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-01-11 03:06:30,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-11 03:06:30,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-01-11 03:06:30,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-01-11 03:06:30,302 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-01-11 03:06:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-11 03:06:30,323 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2022-01-11 03:06:30,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-01-11 03:06:30,325 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 8 [2022-01-11 03:06:30,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-11 03:06:30,331 INFO L225 Difference]: With dead ends: 29 [2022-01-11 03:06:30,332 INFO L226 Difference]: Without dead ends: 14 [2022-01-11 03:06:30,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-01-11 03:06:30,340 INFO L933 BasicCegarLoop]: 21 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, 21 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 [2022-01-11 03:06:30,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-11 03:06:30,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-01-11 03:06:30,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-01-11 03:06:30,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2022-01-11 03:06:30,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-01-11 03:06:30,370 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2022-01-11 03:06:30,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-11 03:06:30,371 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-01-11 03:06:30,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-01-11 03:06:30,371 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-01-11 03:06:30,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-01-11 03:06:30,372 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 03:06:30,372 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-01-11 03:06:30,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-11 03:06:30,372 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 03:06:30,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 03:06:30,373 INFO L85 PathProgramCache]: Analyzing trace with hash 432477998, now seen corresponding path program 1 times [2022-01-11 03:06:30,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 03:06:30,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822389306] [2022-01-11 03:06:30,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:30,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 03:06:30,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:30,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:30,602 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 03:06:30,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822389306] [2022-01-11 03:06:30,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822389306] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-11 03:06:30,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-11 03:06:30,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-11 03:06:30,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715490932] [2022-01-11 03:06:30,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-11 03:06:30,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-11 03:06:30,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-11 03:06:30,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-11 03:06:30,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-11 03:06:30,606 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-01-11 03:06:30,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-11 03:06:30,736 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2022-01-11 03:06:30,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-11 03:06:30,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 8 [2022-01-11 03:06:30,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-11 03:06:30,738 INFO L225 Difference]: With dead ends: 29 [2022-01-11 03:06:30,738 INFO L226 Difference]: Without dead ends: 18 [2022-01-11 03:06:30,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-01-11 03:06:30,739 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-11 03:06:30,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-11 03:06:30,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-01-11 03:06:30,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-01-11 03:06:30,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 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) [2022-01-11 03:06:30,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-01-11 03:06:30,744 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2022-01-11 03:06:30,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-11 03:06:30,746 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-01-11 03:06:30,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-01-11 03:06:30,747 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-01-11 03:06:30,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-01-11 03:06:30,751 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 03:06:30,752 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-11 03:06:30,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-11 03:06:30,752 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 03:06:30,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 03:06:30,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1487706087, now seen corresponding path program 1 times [2022-01-11 03:06:30,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 03:06:30,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445266567] [2022-01-11 03:06:30,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:30,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 03:06:30,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:30,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:30,979 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 03:06:30,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445266567] [2022-01-11 03:06:30,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445266567] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-11 03:06:30,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767532857] [2022-01-11 03:06:30,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:30,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-11 03:06:30,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-11 03:06:30,982 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) [2022-01-11 03:06:30,984 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-11 03:06:31,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:31,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 11 conjunts are in the unsatisfiable core [2022-01-11 03:06:31,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-11 03:06:31,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:31,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-11 03:06:32,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:32,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767532857] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-11 03:06:32,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-11 03:06:32,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5] total 10 [2022-01-11 03:06:32,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922581661] [2022-01-11 03:06:32,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-11 03:06:32,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-11 03:06:32,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-11 03:06:32,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-11 03:06:32,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2022-01-11 03:06:32,478 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 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) [2022-01-11 03:06:34,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-11 03:06:34,920 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2022-01-11 03:06:34,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-11 03:06:34,922 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 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) Word has length 12 [2022-01-11 03:06:34,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-11 03:06:34,922 INFO L225 Difference]: With dead ends: 41 [2022-01-11 03:06:34,923 INFO L226 Difference]: Without dead ends: 34 [2022-01-11 03:06:34,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2022-01-11 03:06:34,924 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 73 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-11 03:06:34,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 31 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-11 03:06:34,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-01-11 03:06:34,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 19. [2022-01-11 03:06:34,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 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) [2022-01-11 03:06:34,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-01-11 03:06:34,930 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2022-01-11 03:06:34,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-11 03:06:34,930 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-01-11 03:06:34,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 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) [2022-01-11 03:06:34,930 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-01-11 03:06:34,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-01-11 03:06:34,930 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 03:06:34,931 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-11 03:06:34,938 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-01-11 03:06:35,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-11 03:06:35,132 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 03:06:35,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 03:06:35,132 INFO L85 PathProgramCache]: Analyzing trace with hash 451035391, now seen corresponding path program 1 times [2022-01-11 03:06:35,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 03:06:35,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774878745] [2022-01-11 03:06:35,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:35,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 03:06:35,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:36,525 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:36,525 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 03:06:36,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774878745] [2022-01-11 03:06:36,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774878745] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-11 03:06:36,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044370319] [2022-01-11 03:06:36,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:36,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-11 03:06:36,526 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-11 03:06:36,532 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) [2022-01-11 03:06:36,558 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-11 03:06:36,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:06:36,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 22 conjunts are in the unsatisfiable core [2022-01-11 03:06:36,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-11 03:06:37,297 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 59 treesize of output 55 [2022-01-11 03:06:39,614 INFO L173 IndexEqualityManager]: detected equality via solver [2022-01-11 03:06:39,620 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-01-11 03:06:39,621 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 105 treesize of output 43 [2022-01-11 03:06:39,974 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:39,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-11 03:06:40,132 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 57 treesize of output 53 [2022-01-11 03:06:40,135 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 68 treesize of output 60 [2022-01-11 03:06:44,248 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:06:44,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044370319] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-11 03:06:44,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-11 03:06:44,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 8] total 23 [2022-01-11 03:06:44,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859772236] [2022-01-11 03:06:44,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-11 03:06:44,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-11 03:06:44,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-11 03:06:44,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-11 03:06:44,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2022-01-11 03:06:44,250 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2022-01-11 03:06:53,913 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-11 03:06:54,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-11 03:06:54,299 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2022-01-11 03:06:54,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-11 03:06:54,300 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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 [2022-01-11 03:06:54,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-11 03:06:54,301 INFO L225 Difference]: With dead ends: 93 [2022-01-11 03:06:54,301 INFO L226 Difference]: Without dead ends: 91 [2022-01-11 03:06:54,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=705, Invalid=2835, Unknown=0, NotChecked=0, Total=3540 [2022-01-11 03:06:54,303 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 226 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 112 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-01-11 03:06:54,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 116 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 255 Invalid, 1 Unknown, 93 Unchecked, 3.9s Time] [2022-01-11 03:06:54,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-01-11 03:06:54,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 21. [2022-01-11 03:06:54,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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) [2022-01-11 03:06:54,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-01-11 03:06:54,312 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2022-01-11 03:06:54,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-11 03:06:54,312 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-01-11 03:06:54,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2022-01-11 03:06:54,312 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-01-11 03:06:54,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-01-11 03:06:54,313 INFO L506 BasicCegarLoop]: Found error trace [2022-01-11 03:06:54,313 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-11 03:06:54,317 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-01-11 03:06:54,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-01-11 03:06:54,514 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-11 03:06:54,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-11 03:06:54,514 INFO L85 PathProgramCache]: Analyzing trace with hash 1874993818, now seen corresponding path program 1 times [2022-01-11 03:06:54,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-11 03:06:54,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134399670] [2022-01-11 03:06:54,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:06:54,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-11 03:06:54,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:07:00,475 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-11 03:07:00,475 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-11 03:07:00,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134399670] [2022-01-11 03:07:00,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134399670] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-11 03:07:00,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274165163] [2022-01-11 03:07:00,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-11 03:07:00,476 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-11 03:07:00,476 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-11 03:07:00,479 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) [2022-01-11 03:07:00,480 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-01-11 03:07:00,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-11 03:07:00,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 41 conjunts are in the unsatisfiable core [2022-01-11 03:07:00,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-11 03:07:01,208 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 27 treesize of output 23 [2022-01-11 03:07:03,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-01-11 03:07:03,497 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 63 treesize of output 62 [2022-01-11 03:07:13,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-01-11 03:07:13,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-01-11 03:07:14,090 INFO L173 IndexEqualityManager]: detected equality via solver [2022-01-11 03:07:14,246 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-01-11 03:07:14,247 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 case distinctions, treesize of input 470 treesize of output 145