THEM: i'll take the book, the ball, and one hat.  YOU: i need the book or the ball  THEM: okay, i'll take the book and the hats, and you can have the ball.  YOU: sorry i meant the book or ball plus something else like 2 hats an and the ball  THEM: i can't give up two hats. i can give up one hat though.  YOU: i'll take the book, ball, and let you have all the hats  THEM: no deal.  YOU: the best i can do is 2 hats and either the book or the ball  THEM: fine, i'll take the book and two hats.