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After the brain samples were incinerated with nitric acid and perchloric acid , the element contents were determined by inductively coupled plasma - atomic emission spectrometry .
 Chemical: nitric acid; Chemical: perchloric acid
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: nitric acid; Chemical: perchloric acid