TASK DEFINITION: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
PROBLEM: THEM: i'd like 1 of each, please.  YOU: i'd like the ball and a hat, rest is yours.  THEM: deal.

SOLUTION: Yes

PROBLEM: THEM: book and one hat for me  YOU: you can have the book and 2 hats.  THEM: deal  YOU: great!

SOLUTION: Yes

PROBLEM: THEM: i need the book and the ball. you can have all the hats.  YOU: deal.

SOLUTION:
Yes

