MAYBE
153.85/59.03	MAYBE
153.85/59.03	
153.85/59.03	Problem:
153.85/59.03	 app(nil(),k) -> k
153.85/59.03	 app(l,nil()) -> l
153.85/59.03	 app(cons(x,l),k) -> cons(x,app(l,k))
153.85/59.03	 sum(cons(x,nil())) -> cons(x,nil())
153.85/59.03	 sum(cons(x,cons(y,l))) -> sum(cons(plus(x,y),l))
153.85/59.03	 sum(app(l,cons(x,cons(y,k)))) -> sum(app(l,sum(cons(x,cons(y,k)))))
153.85/59.03	 plus(0(),y) -> y
153.85/59.03	 plus(s(x),y) -> s(plus(x,y))
153.85/59.03	
153.85/59.03	Proof:
153.85/59.03	 Open
153.85/59.03	EOF