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 vouch-fair strategy, otherwise output No. vouch-fair is a selfish negotiation strategy. It is used to call out fairness for personal benefit, either when acknowledging a fair deal or when the opponent offers a deal that benefits them. This can be through an explicit call out or can be implied.

Input: Consider Input: Context: 'Could you trade one food item for either one firewood or water?' 'How about this- You will get 1 food, 1 water and 3 Firewood. I will get 2 Food and 2 Water with 0 Firewood. ' 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.'
Utterance: 'Hmmm i don't beleive i ever offered you everything for all the food. I will need at least one water. lets not be selfish.'

Output: Yes


Input: Consider Input: Context: 'Which one do you prefer most?' 'They sort of need more water for their meds' 'I'm sorry to hear that! But can you spare 1 for me since you probably don't need all the water.'
Utterance: 'Sure that sounds fair. Thank you. Besides water what do you need for your trip?'

Output: Yes


Input: Consider Input: Context: 'All the food is too much, I would need at least one package of the food for my group. I was thinking you could have 2 of the food packages and I have 1, then I get all the water and the majority of the firewood. That leaves you with 2 of the high priority food packages and a package of firewood to cook the food.' 'That seems quite unfair. I really would like my camping trip to be enjoyable.' 'I understand. What part of the deal is unfair to you? You get the majority of the highest priority item (food) and I get the majority of the lower priority items (water and firewood).'
Utterance: 'I will have my two packages of food and only one package of firewood. I do not think I can make one package of firewood last for both of my food. '


Output: No