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: 'The most important is water because I have kidney problem so i need some more water.Without water I can't live.' 'I understand that completely. Would you be willing to take 2 waters, and I take 1 water? I still do need some water for my family. I can't have anyone getting heat stroke. But you can have more.' 'Okay.But I need whole water to survive.'
Utterance: 'Of course. So, what about food? I will definitely need the food. I have a big family, and we all need to eat. I can't have people starving. Can I take all of the food?'
Example Output: Yes

Example Input: Context: 'Hello, I'm hopping I could grab most of the food, I have a lot of hungry mouths to feed.' 'Hi - I can understand that. I have quite a few mouths to feed as well'
Utterance: 'hmmm, well what are you looking to get'
Example Output: Yes

Example Input: Context: 'I don't think I will be able to give you 2 waters. I'm desperate. I need at least 2. I would give you 1 if I could get 3 packages of food. I would give you all the firewood. ' 'If i give you 3 packages of food then i will take 3 packages of firewood.' 'So I get 2 waters and 3 foods. and you get the rest?'
Utterance: 'I could use one food too. How am i going to survive without eating anything?'
Example Output:
No