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Lipid analysis demonstrated that eight of the nine classes of ceramides were increased by TCDD , altering the ratio of ceramides to free fatty acids .
 Chemical: ceramides; Chemical: TCDD; Chemical: ceramides; Chemical: fatty acids
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: ceramides; Chemical: TCDD; Chemical: ceramides; Chemical: fatty acids