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Robert D. Putnam ( 1993 ) suggested that social capital would facilitate co-operation and mutually supportive relations in communities and nations and would therefore be a valuable means of combating many of the social disorders inherent in modern societies , for example crime .
 person: Robert D. Putnam
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Robert D. Putnam