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One of the most popular solutions is to claim , as William Lycan and Robert Adams do , that " possible worlds " talk can be reduced to logical relations amongst consistent and maximally complete " sets of propositions " .
 person: William Lycan; person: Robert Adams
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: William Lycan, Robert Adams 
Answer:
 person: William Lycan; person: Robert Adams