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He was traded , along with Bob O'Brien , Sergio Robles and Royle Stillman , to the Baltimore Orioles for Frank Robinson and Pete Richert in the offseason .
 person: Bob O'Brien; person: Sergio Robles; person: Royle Stillman; organization: Baltimore Orioles; person: Frank Robinson; person: Pete Richert
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: Bob O'Brien; person: Sergio Robles; person: Royle Stillman; organization: Baltimore Orioles; person: Frank Robinson; person: Pete Richert