Thank you for your reply. But it is hard to say which fruit is "required". As, for example, an apple makes Allen happy, but if there is no apple, a banana may also does. Each person may have may combinations of fruits which make them happy. There are many choices with different cost for a people, and each selection is OK. When a selection is made for one person, it may influence the cost of other person's choice. As there may be some same fruits in their choice. My question is, which combination of all person's choice will have the least cost? Thank you for any reply.
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