THEM: i would like the book and the ball  YOU: i need the book and ball  THEM: i will give you one or the other but not both  YOU: a book and three hats for me?  THEM: i will give you the book an 1 hat  YOU: two hats and the book  THEM: can't do it unless i get the book and the ball then you can have all three hats  YOU: cant be a deal without two hats and the book, or three hats and the ball  THEM: sorry i get the book and the ball and you get three hats or you get the book and 1 hat that is the only 2 deals i can offer  YOU: book and a hat for me  THEM: yes.