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" , who recognized the embryo as oviraptorid , assigned it to the genus " Citipati " in 2001 , based on the vertical orientation of the premaxilla ( a bone structure at the tip of the jaw ) , a feature found only in " Citipati " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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