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.

Ex Input:
Context: 'Will you give me 2 packages of food and i give you 1 package of water?' 'Hello! I can give you 2 packages of food of you give me 3 packages of water' 'Let me give you 2 packages of water for 3 packages of food.'
Utterance: 'well, food is more valuable for me. what is your preference?'

Ex Output:
Yes


Ex Input:
Context: 'if i accept the deal, how much will i get ?' 'You get 1 water 2 firewood and 2 food packages.' 'i propose, 2 water, 1 food and 2 firewood to you, is that good ?'
Utterance: 'Sorry I can't do that 1 water is not enough for me. '

Ex Output:
No


Ex Input:
Context: 'hi, how are you? my main need is water. how bout you?' 'Hey hi, nice getting to interact with you. I'm doing good, thank you. Wish it's the same with you. I get dehydrated quickly and need additional packages of water.'
Utterance: 'we both have the same high value priority. what is number 2 for you? thanks'

Ex Output:

Yes