Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: i really need the book, and i'd like the balls too YOU: sorry, i want the book and 4 hats or no deal THEM: i can't make a deal without the book, so no deal YOU: then take only the book and i take the rest.
Output:
Yes