MAYBE
0.08/0.18	MAYBE
0.08/0.18	
0.08/0.18	Problem:
0.08/0.18	 a__2nd(cons1(X,cons(Y,Z))) -> mark(Y)
0.08/0.18	 a__2nd(cons(X,X1)) -> a__2nd(cons1(mark(X),mark(X1)))
0.08/0.18	 a__from(X) -> cons(mark(X),from(s(X)))
0.08/0.18	 mark(2nd(X)) -> a__2nd(mark(X))
0.08/0.18	 mark(from(X)) -> a__from(mark(X))
0.08/0.18	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
0.08/0.18	 mark(s(X)) -> s(mark(X))
0.08/0.18	 mark(cons1(X1,X2)) -> cons1(mark(X1),mark(X2))
0.08/0.18	 a__2nd(X) -> 2nd(X)
0.08/0.18	 a__from(X) -> from(X)
0.08/0.18	
0.08/0.18	Proof:
0.08/0.18	 Open
0.08/0.19	EOF