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-DOCSTART- RT @EricBlake12 : Anyone w / a rain gauge should email it to @NWSHouston - this is a historic event & amp ; we should document as best as possible to learn # Harvey https://t.co/3WWM0HOKwF
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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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