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Compared with placebo , modafinil decreased nighttime sleep latency and increased slow - wave sleep time in cocaine - dependent participants .
 Chemical: modafinil; Chemical: cocaine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: modafinil, cocaine 
Answer:
 Chemical: modafinil; Chemical: cocaine