201994
By June 11 , over 400 persons were fighting the fire , and hotshot crew s and bulldozers were utilized to create fire break s. Air tanker s and helicopters were also used to dump water and fire retardant near homes threatened by the fire .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None