1668
The refined washing procedure allowed to correctly identify all in vivo skin irritant materials showing the same sensitivity as the normal washing procedures , and further increased the specificity of the assay from 5 to 6 correct predictions out of 7 non irritants as compared to the normal washing procedures .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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