MAYBE
250.92/62.48	MAYBE
250.92/62.48	
250.92/62.48	Problem:
250.92/62.48	 active(zeros()) -> mark(cons(0(),zeros()))
250.92/62.48	 active(and(tt(),X)) -> mark(X)
250.92/62.48	 active(length(nil())) -> mark(0())
250.92/62.48	 active(length(cons(N,L))) -> mark(s(length(L)))
250.92/62.48	 mark(zeros()) -> active(zeros())
250.92/62.48	 mark(cons(X1,X2)) -> active(cons(mark(X1),X2))
250.92/62.48	 mark(0()) -> active(0())
250.92/62.48	 mark(and(X1,X2)) -> active(and(mark(X1),X2))
250.92/62.48	 mark(tt()) -> active(tt())
250.92/62.48	 mark(length(X)) -> active(length(mark(X)))
250.92/62.48	 mark(nil()) -> active(nil())
250.92/62.48	 mark(s(X)) -> active(s(mark(X)))
250.92/62.48	 cons(mark(X1),X2) -> cons(X1,X2)
250.92/62.48	 cons(X1,mark(X2)) -> cons(X1,X2)
250.92/62.48	 cons(active(X1),X2) -> cons(X1,X2)
250.92/62.48	 cons(X1,active(X2)) -> cons(X1,X2)
250.92/62.48	 and(mark(X1),X2) -> and(X1,X2)
250.92/62.48	 and(X1,mark(X2)) -> and(X1,X2)
250.92/62.48	 and(active(X1),X2) -> and(X1,X2)
250.92/62.48	 and(X1,active(X2)) -> and(X1,X2)
250.92/62.48	 length(mark(X)) -> length(X)
250.92/62.48	 length(active(X)) -> length(X)
250.92/62.48	 s(mark(X)) -> s(X)
250.92/62.48	 s(active(X)) -> s(X)
250.92/62.48	
250.92/62.48	Proof:
250.92/62.48	 Open
250.92/62.48	EOF