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Clean - up of extracts was performed by solid - phase extraction using C18 and glass columns containing silica gel and florisil for USAE or only C18 for USAEME .
 Chemical: silica gel; Chemical: florisil
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: silica gel; Chemical: florisil