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When his brother Michael Spinks defeated Larry Holmes in a controversial upset for the IBF heavyweight championship in 1985 , they became the only brothers to have held world heavyweight championships .
 person: Michael Spinks; person: Larry Holmes; organization: IBF
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: Michael Spinks; person: Larry Holmes; organization: IBF