THEM: can i get the ball and hats?  YOU: you can have the hats. i 'd like the rest.  THEM: i really want the ball. you can have the books though.  YOU: i need the ball. you can have the books and the hats.  THEM: no deal. what if you get everything but the ball?  YOU: i can't do that.  THEM: well i need the ball.  YOU: you can have it then. i will take the rest.  THEM: okay, deal.