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Although pre-twentieth century naturalists such as Charles Darwin made game-theoretic kinds of statements , the use of game-theoretic analysis in biology began with Ronald Fisher 's studies of animal behavior during the 1930 s .
 person: Charles Darwin; person: Ronald Fisher
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: Charles Darwin; person: Ronald Fisher