MAYBE
249.50/63.45	MAYBE
249.50/63.45	
249.50/63.45	Problem:
249.50/63.45	 a__zeros() -> cons(0(),zeros())
249.50/63.45	 a__U11(tt(),L) -> a__U12(tt(),L)
249.50/63.45	 a__U12(tt(),L) -> s(a__length(mark(L)))
249.50/63.45	 a__length(nil()) -> 0()
249.50/63.45	 a__length(cons(N,L)) -> a__U11(tt(),L)
249.50/63.45	 mark(zeros()) -> a__zeros()
249.50/63.45	 mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
249.50/63.45	 mark(U12(X1,X2)) -> a__U12(mark(X1),X2)
249.50/63.45	 mark(length(X)) -> a__length(mark(X))
249.50/63.45	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
249.50/63.45	 mark(0()) -> 0()
249.50/63.45	 mark(tt()) -> tt()
249.50/63.45	 mark(s(X)) -> s(mark(X))
249.50/63.45	 mark(nil()) -> nil()
249.50/63.45	 a__zeros() -> zeros()
249.50/63.45	 a__U11(X1,X2) -> U11(X1,X2)
249.50/63.45	 a__U12(X1,X2) -> U12(X1,X2)
249.50/63.45	 a__length(X) -> length(X)
249.50/63.45	
249.50/63.45	Proof:
249.50/63.45	 Open
249.50/63.46	EOF