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Our results showed synergistic and additive interactions against all S . aureus strains tested ( sum FIC 0 . 288 - 0 . 631 ) , two of which were multidrug resistant .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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