18942
Of the 187 exposures not involving other substances , 96 . 8 % were known or expected to result in at most minor effects , and 71 . 1 % were managed on site ( at residence ) .
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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:
 None