MAYBE
236.81/61.07	MAYBE
236.81/61.07	
236.81/61.07	Problem:
236.81/61.07	 a__f(0()) -> cons(0(),f(s(0())))
236.81/61.07	 a__f(s(0())) -> a__f(a__p(s(0())))
236.81/61.07	 a__p(s(X)) -> mark(X)
236.81/61.07	 mark(f(X)) -> a__f(mark(X))
236.81/61.07	 mark(p(X)) -> a__p(mark(X))
236.81/61.07	 mark(0()) -> 0()
236.81/61.07	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
236.81/61.07	 mark(s(X)) -> s(mark(X))
236.81/61.07	 a__f(X) -> f(X)
236.81/61.07	 a__p(X) -> p(X)
236.81/61.07	
236.81/61.07	Proof:
236.81/61.07	 Open
236.81/61.07	EOF