THEM: i need 1 ball, 1 hat, and 1 book  YOU: you can have 1 hat and 1 book  THEM: i need the ball  YOU: i need the ball too.  THEM: ok how about you take the ball and i will get 2 hats and 3 books?  YOU: how about 1 book and 1 hat?  THEM: no if i do not get the ball i need all of the rest  YOU: ok, 1 book, 1 ball, and 1 hat?  THEM: no i will take the ball then you can have 3 books and 2 hats  YOU: ok  THEM: so i take the ball and you get the rest?