The input is taken from a negotiation between two participants who take the role of campsite neighbors and negotiate for Food, Water, and Firewood packages, based on their individual preferences and requirements. Given an utterance and recent dialogue context containing past 3 utterances (wherever available), output Yes if the utterance contains the elicit-pref strategy, otherwise output No. elicit-pref is a cooperative negotiation strategy. It is used to discover the preference order of the opponent in the negotiation.

Input: Consider Input: Context: 
Utterance: 'Hello.  What are your preferences for extra items for your camping trip?'

Output: Yes


Input: Consider Input: Context: 'Water is important!! To me firewood is more important as I have anemia and I'm ALWAYS cold lol' 'Alright. I have a  feeling we will have a deal then. How about you give me two water for a firewood?' 'that sounds like a plan'
Utterance: 'how many firewood you need? Maybe we could also exchange one food for one more firewood?'

Output: Yes


Input: Consider Input: Context: 'I get it, in that case and to be a fair deal. I will have 2 of food, 1 of water and firewood each.' 'That seems fair however I would like to have plenty of food also. I think it would be fair to have 2 firewood, 1 food and 2 water ' 'I ain't sure if you want 1 or 2 packages of food'
Utterance: 'I would like 2 packages of food'


Output: No