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He also often stayed at the homes of Ruth Pitter and Richard Rees , where he could " change " for his sporadic tramping expeditions .
 person: Ruth Pitter; person: Richard Rees
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ruth Pitter, Richard Rees 
Answer:
 person: Ruth Pitter; person: Richard Rees