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-DOCSTART- RT @USCG : A @USCGHeartland aircrew rescues 5 people from floodwaters in a SE # Houston neighborhood # Harvey # HurricaneHarvey # USCG https://t.co/p0EfTwT37B
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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:
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