Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: i would like the book and the hat.  YOU: i think we might both be in the same boat, what one has more value to you?  THEM: i would prefer the hat - may i have the hat and two balls?  YOU: if i give you the hat i would like to have all 3 of the balls  THEM: i cannot accept just one object so i will need at least one ball.  YOU: the sum of the book and balls doesn't equal the sum of the hat to me  THEM: ok, can i have the book and balls and you take the hat then?  YOU: i can make that deal.
Output:
Yes