THEM: hey, i want the hats and balls  YOU: how about you take all the hats ; i'll take the balls and the book.  THEM: nope  YOU: alright, i take book and 1 ball ; you take hats and 1 ball?  THEM: hmmm, i want both balls though  YOU: i understand that, but we can deduce the point value from what's being shown. i'm willing to go even with you ; i'll take book and 1 ball. you take rest.