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Aggregation was lower ( P < . 05 ) in the ketoprofen group than in the acetaminophen group just before surgery and on the third postoperative day .
 Chemical: ketoprofen; Chemical: acetaminophen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: ketoprofen; Chemical: acetaminophen