MAYBE
0.09/0.19	MAYBE
0.09/0.19	
0.09/0.19	Problem:
0.09/0.19	 active(h(X)) -> mark(g(X,X))
0.09/0.19	 active(g(a(),X)) -> mark(f(b(),X))
0.09/0.19	 active(f(X,X)) -> mark(h(a()))
0.09/0.19	 active(a()) -> mark(b())
0.09/0.19	 active(h(X)) -> h(active(X))
0.09/0.19	 active(g(X1,X2)) -> g(active(X1),X2)
0.09/0.19	 active(f(X1,X2)) -> f(active(X1),X2)
0.09/0.19	 h(mark(X)) -> mark(h(X))
0.09/0.19	 g(mark(X1),X2) -> mark(g(X1,X2))
0.09/0.19	 f(mark(X1),X2) -> mark(f(X1,X2))
0.09/0.19	 proper(h(X)) -> h(proper(X))
0.09/0.19	 proper(g(X1,X2)) -> g(proper(X1),proper(X2))
0.09/0.19	 proper(a()) -> ok(a())
0.09/0.19	 proper(f(X1,X2)) -> f(proper(X1),proper(X2))
0.09/0.19	 proper(b()) -> ok(b())
0.09/0.19	 h(ok(X)) -> ok(h(X))
0.09/0.19	 g(ok(X1),ok(X2)) -> ok(g(X1,X2))
0.09/0.19	 f(ok(X1),ok(X2)) -> ok(f(X1,X2))
0.09/0.19	 top(mark(X)) -> top(proper(X))
0.09/0.19	 top(ok(X)) -> top(active(X))
0.09/0.19	
0.09/0.19	Proof:
0.09/0.19	 Open
0.09/0.19	EOF