MAYBE
0.08/0.18	MAYBE
0.08/0.18	
0.08/0.18	Problem:
0.08/0.18	 +(x,0()) -> x
0.08/0.18	 +(0(),x) -> x
0.08/0.18	 +(s(x),s(y)) -> s(s(+(x,y)))
0.08/0.18	 *(x,0()) -> 0()
0.08/0.18	 *(0(),x) -> 0()
0.08/0.18	 *(s(x),s(y)) -> s(+(*(x,y),+(x,y)))
0.08/0.18	 sum(nil()) -> 0()
0.08/0.18	 sum(cons(x,l)) -> +(x,sum(l))
0.08/0.18	 prod(nil()) -> s(0())
0.08/0.18	 prod(cons(x,l)) -> *(x,prod(l))
0.08/0.18	
0.08/0.18	Proof:
0.08/0.18	 Open
0.08/0.18	EOF