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