MAYBE
165.43/60.16	MAYBE
165.43/60.16	
165.43/60.16	Problem:
165.43/60.16	 app(nil(),k) -> k
165.43/60.16	 app(l,nil()) -> l
165.43/60.16	 app(cons(x,l),k) -> cons(x,app(l,k))
165.43/60.16	 sum(cons(x,nil())) -> cons(x,nil())
165.43/60.16	 sum(cons(x,cons(y,l))) -> sum(cons(plus(x,y),l))
165.43/60.16	 sum(app(l,cons(x,cons(y,k)))) -> sum(app(l,sum(cons(x,cons(y,k)))))
165.43/60.16	 plus(0(),y) -> y
165.43/60.16	 plus(s(x),y) -> s(plus(x,y))
165.43/60.16	 sum(plus(cons(0(),x),cons(y,l))) -> pred(sum(cons(s(x),cons(y,l))))
165.43/60.16	 pred(cons(s(x),nil())) -> cons(x,nil())
165.43/60.16	
165.43/60.16	Proof:
165.43/60.16	 Open
165.43/60.17	EOF