5761
Otto Schreier published an algebraic proof of this result in 1927 , and Kurt Reidemeister included a comprehensive treatment of free groups in his 1932 book on combinatorial topology .
 person: Otto Schreier; person: Kurt Reidemeister
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Otto Schreier; person: Kurt Reidemeister