Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: if i can have the hats, you can have the rest  YOU: i need the hats as well. if we can split the difference i can take one hat and the two books and you can have one hat and the two balls  THEM: perfect, i'll take one hat, and two balls  YOU: okay great!
Output:
Yes