THEM: can i have the hats and book and you can have the balls?  YOU: i'll need that book. you can have a hat and a ball.  THEM: i would need both hats and both balls to be able to give you the book  YOU: what if i keep both hats and both balls and you keep the book?  THEM: no, i would need the book and at least 1 hat and you can have both balls and the other hat  YOU: i can't make that deal. what if you keep both hats and i take the rest.  THEM: can i have both hats and 1 ball?  YOU: ok. i keep the book and one ball.  THEM: deal.