MAYBE
238.80/60.42	MAYBE
238.80/60.42	
238.80/60.42	Problem:
238.80/60.42	 active(nats()) -> mark(adx(zeros()))
238.80/60.42	 active(zeros()) -> mark(cons(0(),zeros()))
238.80/60.42	 active(incr(cons(X,Y))) -> mark(cons(s(X),incr(Y)))
238.80/60.42	 active(adx(cons(X,Y))) -> mark(incr(cons(X,adx(Y))))
238.80/60.42	 active(hd(cons(X,Y))) -> mark(X)
238.80/60.42	 active(tl(cons(X,Y))) -> mark(Y)
238.80/60.42	 active(adx(X)) -> adx(active(X))
238.80/60.42	 active(incr(X)) -> incr(active(X))
238.80/60.42	 active(hd(X)) -> hd(active(X))
238.80/60.42	 active(tl(X)) -> tl(active(X))
238.80/60.42	 adx(mark(X)) -> mark(adx(X))
238.80/60.42	 incr(mark(X)) -> mark(incr(X))
238.80/60.42	 hd(mark(X)) -> mark(hd(X))
238.80/60.42	 tl(mark(X)) -> mark(tl(X))
238.80/60.42	 proper(nats()) -> ok(nats())
238.80/60.42	 proper(adx(X)) -> adx(proper(X))
238.80/60.42	 proper(zeros()) -> ok(zeros())
238.80/60.42	 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
238.80/60.42	 proper(0()) -> ok(0())
238.80/60.42	 proper(incr(X)) -> incr(proper(X))
238.80/60.42	 proper(s(X)) -> s(proper(X))
238.80/60.42	 proper(hd(X)) -> hd(proper(X))
238.80/60.42	 proper(tl(X)) -> tl(proper(X))
238.80/60.42	 adx(ok(X)) -> ok(adx(X))
238.80/60.42	 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
238.80/60.42	 incr(ok(X)) -> ok(incr(X))
238.80/60.42	 s(ok(X)) -> ok(s(X))
238.80/60.42	 hd(ok(X)) -> ok(hd(X))
238.80/60.42	 tl(ok(X)) -> ok(tl(X))
238.80/60.42	 top(mark(X)) -> top(proper(X))
238.80/60.42	 top(ok(X)) -> top(active(X))
238.80/60.42	
238.80/60.42	Proof:
238.80/60.42	 Open
238.80/60.42	EOF