THEM: hi, can i have all the balls?  YOU: what about i give you 3 balls and you give me 2 books  THEM: i`ll give you 2 books and one ball. i`ll take 3 balls and one hat  YOU: i will give you 4 balls for 2 books  THEM: ok, and the hat. i`ll get 4 balls and the hat  YOU: no hat  THEM: ok, i`ll take 4 balls and you get one hat and 2 books  YOU: deal, you get four balls and i get 2 books and one hat.