THEM: i'll give you 1 hat for 1 book and 2 balls  YOU: how about i get 1 book and 2 hats, you get rest  THEM: 2 hats for 1 book and 2 balls  YOU: how about i get the book and a hat  THEM: 3 hats for 1 book and 2 balls  YOU: book and 2 hats for me  THEM: no deal  YOU: all hats and balls for me  THEM: 1 book and 1 ball for me  YOU: deal.