THEM: i would like the ball and the books  YOU: i will give you both books and a hat  THEM: i can not do that. i do need the ball.  YOU: if you give me both hats and both books i will give you the ball  THEM: you can have both hats. can i have 1 book and the ball?  YOU: no i need both hats and both books  THEM: okay. deal.