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-DOCSTART- RT @HoustonChron : Incredible image of # Harvey in # Houston shows immense flood rescue effort . https://t.co/HT7bYNKLxR https://t.co/9zzbWh9SUU
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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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