MAYBE
419.92/104.84	MAYBE
419.92/104.84	
419.92/104.84	Problem:
419.92/104.84	 active(f(0())) -> mark(cons(0(),f(s(0()))))
419.92/104.84	 active(f(s(0()))) -> mark(f(p(s(0()))))
419.92/104.84	 active(p(s(0()))) -> mark(0())
419.92/104.84	 active(f(X)) -> f(active(X))
419.92/104.84	 active(cons(X1,X2)) -> cons(active(X1),X2)
419.92/104.84	 active(s(X)) -> s(active(X))
419.92/104.84	 active(p(X)) -> p(active(X))
419.92/104.84	 f(mark(X)) -> mark(f(X))
419.92/104.84	 cons(mark(X1),X2) -> mark(cons(X1,X2))
419.92/104.84	 s(mark(X)) -> mark(s(X))
419.92/104.84	 p(mark(X)) -> mark(p(X))
419.92/104.84	 proper(f(X)) -> f(proper(X))
419.92/104.84	 proper(0()) -> ok(0())
419.92/104.84	 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
419.92/104.84	 proper(s(X)) -> s(proper(X))
419.92/104.84	 proper(p(X)) -> p(proper(X))
419.92/104.84	 f(ok(X)) -> ok(f(X))
419.92/104.84	 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
419.92/104.84	 s(ok(X)) -> ok(s(X))
419.92/104.84	 p(ok(X)) -> ok(p(X))
419.92/104.84	 top(mark(X)) -> top(proper(X))
419.92/104.84	 top(ok(X)) -> top(active(X))
419.92/104.84	
419.92/104.84	Proof:
419.92/104.84	 Open
419.92/104.85	EOF