THEM: i'd like the books and ball  YOU: take your books and leave me the ball and hats i'll give you one hat  THEM: can't do that. i'll take ball and 2 books. rest is yours. deal?  YOU: if there isn't a ball in my deal then there is no deal.  THEM: take ball, i take the rest  YOU: i'll take the ball with either a hat or book  THEM: sure, have the ball and a hat  YOU: deal.