703.28/299.39	MAYBE
703.28/299.39	
703.28/299.39	Problem:
703.28/299.39	 strict:
703.28/299.39	  app(nil(),k) -> k
703.28/299.39	  app(l,nil()) -> l
703.28/299.39	  app(cons(x,l),k) -> cons(x,app(l,k))
703.28/299.39	  sum(cons(x,nil())) -> cons(x,nil())
703.28/299.39	  sum(cons(x,cons(y,l))) -> sum(cons(plus(x,y),l))
703.28/299.39	  sum(app(l,cons(x,cons(y,k)))) -> sum(app(l,sum(cons(x,cons(y,k)))))
703.28/299.39	  plus(0(),y) -> y
703.28/299.39	  plus(s(x),y) -> s(plus(x,y))
703.28/299.39	  sum(plus(cons(0(),x),cons(y,l))) -> pred(sum(cons(s(x),cons(y,l))))
703.28/299.39	  pred(cons(s(x),nil())) -> cons(x,nil())
703.28/299.39	 weak:
703.28/299.39	  cons(x,cons(y,l)) -> cons(y,cons(x,l))
703.28/299.39	
703.28/299.39	Proof:
703.28/299.39	 Open
703.28/299.40	EOF