MAYBE
236.51/60.36	MAYBE
236.51/60.37	
236.51/60.37	Problem:
236.51/60.37	 active(zeros()) -> mark(cons(0(),zeros()))
236.51/60.37	 active(and(tt(),X)) -> mark(X)
236.51/60.37	 active(length(nil())) -> mark(0())
236.51/60.37	 active(length(cons(N,L))) -> mark(s(length(L)))
236.51/60.37	 active(cons(X1,X2)) -> cons(active(X1),X2)
236.51/60.37	 active(and(X1,X2)) -> and(active(X1),X2)
236.51/60.37	 active(length(X)) -> length(active(X))
236.51/60.37	 active(s(X)) -> s(active(X))
236.51/60.37	 cons(mark(X1),X2) -> mark(cons(X1,X2))
236.51/60.37	 and(mark(X1),X2) -> mark(and(X1,X2))
236.51/60.37	 length(mark(X)) -> mark(length(X))
236.51/60.37	 s(mark(X)) -> mark(s(X))
236.51/60.37	 proper(zeros()) -> ok(zeros())
236.51/60.37	 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
236.51/60.37	 proper(0()) -> ok(0())
236.51/60.37	 proper(and(X1,X2)) -> and(proper(X1),proper(X2))
236.51/60.37	 proper(tt()) -> ok(tt())
236.51/60.37	 proper(length(X)) -> length(proper(X))
236.51/60.37	 proper(nil()) -> ok(nil())
236.51/60.37	 proper(s(X)) -> s(proper(X))
236.51/60.37	 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
236.51/60.37	 and(ok(X1),ok(X2)) -> ok(and(X1,X2))
236.51/60.37	 length(ok(X)) -> ok(length(X))
236.51/60.37	 s(ok(X)) -> ok(s(X))
236.51/60.37	 top(mark(X)) -> top(proper(X))
236.51/60.37	 top(ok(X)) -> top(active(X))
236.51/60.37	
236.51/60.37	Proof:
236.51/60.37	 Open
236.51/60.37	EOF