MAYBE
0.09/0.17	MAYBE
0.09/0.17	
0.09/0.17	Problem:
0.09/0.17	 a__from(X) -> cons(mark(X),from(s(X)))
0.09/0.17	 a__length(nil()) -> 0()
0.09/0.17	 a__length(cons(X,Y)) -> s(a__length1(Y))
0.09/0.17	 a__length1(X) -> a__length(X)
0.09/0.17	 mark(from(X)) -> a__from(mark(X))
0.09/0.17	 mark(length(X)) -> a__length(X)
0.09/0.17	 mark(length1(X)) -> a__length1(X)
0.09/0.17	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
0.09/0.17	 mark(s(X)) -> s(mark(X))
0.09/0.17	 mark(nil()) -> nil()
0.09/0.17	 mark(0()) -> 0()
0.09/0.17	 a__from(X) -> from(X)
0.09/0.17	 a__length(X) -> length(X)
0.09/0.17	 a__length1(X) -> length1(X)
0.09/0.17	
0.09/0.17	Proof:
0.09/0.17	 Open
0.09/0.17	EOF