16103
In this work , we applied SVM methods to examine pollution profiles and mutagenicity of 60 water samples obtained from 6 cities in China during 2006 - 2011 .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None