MAYBE
0.08/0.17	MAYBE
0.08/0.17	
0.08/0.17	Problem:
0.08/0.17	 fib(0()) -> 0()
0.08/0.17	 fib(s(0())) -> s(0())
0.08/0.17	 fib(s(s(x))) -> +(fib(s(x)),fib(x))
0.08/0.17	
0.08/0.17	Proof:
0.08/0.17	 Open
0.08/0.18	EOF