Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: i'd like the two hats and the book. YOU: can i have the the book, one hat and one ball THEM: you can have the three balls and a hat but i need that book. YOU: i really need that book too, you take book i take the rest THEM: deal. i get the book you can have the rest.
Output:
Yes