/export/starexec/sandbox/solver/bin/starexec_run_ttt2-1.17+nonreach /export/starexec/sandbox/benchmark/theBenchmark.xml /export/starexec/sandbox/output/output_files


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MAYBE

Problem:
 f(tt(),x) -> f(swap(x,0()),s(x))
 swap(s(x),y) -> swap(x,s(y))
 swap(0(),s(y)) -> decr(s(y))
 decr(s(y)) -> decr(y)
 decr(0()) -> tt()

Proof:
 Open