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.

Example Input: Context: 'how do you propose we split the food then?' 'Well I don't mind either way about the food. I'll recommend giving you 2 firewood 1 food and 1 water. ' 'how about you get 3 waters and 2 foods? Does that work better?'
Utterance: 'yes how much firewood. I need at least 1 to cook the food.'
Example Output: No

Example Input: Context: 
Utterance: 'Hi!  I want some additional packages of firewood, water, and food'
Example Output: No

Example Input: Context: 'It is! What do you think?' 'The item of greatest value to me is WATER. Before thinking about an offer I need to know what your priorities are and you need to know mine in order to conclude something fair for both of you.' 'My priority is FOOD. How about I get 3 food and you get 3 water?'
Utterance: 'What is the least valuable item for you?'
Example Output:
Yes