THEM: i would like 1 book and 2 balls.  YOU: you can have the ball but i would like the book and the hats  THEM: you can have 3 hats and 1 ball, if i can have 1 book and 1 ball.  YOU: if you get the book i have to have the rets. or i will take the book and you have the rest  THEM: hmm, okay i'll take the book and you can get the rest.  YOU: ok.