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In contrast , two leading theorists emphasize the fact that truth conditions cannot be specified for a metaphor. Max Black maintains that metaphors are too open-ended to be able to function as referring expressions , and so cannot be expressions which have truth conditions .
 person: Max Black
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: Max Black 
Answer:
 person: Max Black