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Similarly , Percy Williams Bridgman is credited with the methodological position known as operationalism , which asserts that all observations are not only influenced , but necessarily defined , by the means and assumptions used to measure them .
 person: Percy Williams Bridgman
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: Percy Williams Bridgman 
Answer:
 person: Percy Williams Bridgman