MAYBE
231.50/59.98	MAYBE
231.50/59.98	
231.50/59.98	Problem:
231.50/59.98	 a__f(0()) -> cons(0(),f(s(0())))
231.50/59.98	 a__f(s(0())) -> a__f(a__p(s(0())))
231.50/59.98	 a__p(s(X)) -> mark(X)
231.50/59.98	 mark(f(X)) -> a__f(mark(X))
231.50/59.98	 mark(p(X)) -> a__p(mark(X))
231.50/59.98	 mark(0()) -> 0()
231.50/59.98	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
231.50/59.98	 mark(s(X)) -> s(mark(X))
231.50/59.98	 a__f(X) -> f(X)
231.50/59.98	 a__p(X) -> p(X)
231.50/59.98	
231.50/59.98	Proof:
231.50/59.98	 Open
231.50/59.98	EOF