THEM: i need the hats and the ball. you can have both books.  YOU: i need a book, a hat and the ball.  THEM: i can't give up the ball. you can have 2 books and 1 hat.  YOU: i can't give up the hat and the ball.  THEM: i can't give up the ball. i'll take the ball and two books you can take both hats.  YOU: i will not agree to that deal.  THEM: ok i need both hats and a book then. you can have the ball and a book.  YOU: no deal, i want a book, a hat and a ball.  THEM: no deal. i at least need the ball and a hat, or both hats and a book.  YOU: then i guess we have no deal.  THEM: agreed no deal.