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He played on a line with Mark Messier and had a successful campaign , finishing second to Wayne Gretzky for Rookie-of-the-Year honors .
 person: Mark Messier; person: Wayne Gretzky
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: Mark Messier, Wayne Gretzky 
Answer:
 person: Mark Messier; person: Wayne Gretzky