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By next year callers will be able to see as well as hear each other , thanks to the addition of a tiny video monitor .
 person: callers; person: each other
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
 Entities: callers, each other 
Answer:
 person: callers; person: each other