THEM: i would like the 2 books you can have the hats and ball  YOU: i would like 1 book and both hats  THEM: i can give you both hats for both books  YOU: i can do that so i will take 2 hats and you get 2 books who gets the ball  THEM: you can have the ball  YOU: ok deal i get 2 hats and 1 ball  THEM: yes.