THEM: i'd like 1 book and 2 hats and you can have the rest.  YOU: i want book and ball  THEM: you can have book only if i can have all hats and all balls  YOU: i will take ball and 3 hats  THEM: that works for me, confirming that i get 1 ball and 1 hat.  YOU: no, you get book and 1 hat  THEM: sorry about that, that's what i meant to type, i get 1 book and 1 hat.  YOU: yes  THEM: confirming deal.