THEM: i will like to give you two hats  YOU: i prefer 3 books and 1 hat  THEM: what about 1 book 1 ball and 2 hat  YOU: i don't want balls. i'll take 2 books and 2 hats  THEM: okay is a deal  YOU: ok deal  THEM: good  YOU: 2 books and 2 hats  THEM: yes.