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-DOCSTART- RT @abc13houston : WATCH LIVE : Incredible helicopter rescues underway right now , plucking victims from flood waters https://t.co/y6m66VCQjN # HoustonFlood https://t.co/y6kHl0b29 m
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: exact location, area, road, river 
Text: {0} 
Answer:
 None