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Few samples had selenium : mercury molar ratios below 1 , but there was a wide range in ratios , complicating the interpretation for use in risk management and communication .
 Chemical: selenium; Chemical: mercury
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: selenium; Chemical: mercury