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Marisa cornuarietis , common name the giant ramshorn snail , is a species of large freshwater snail with an operculum , an aquatic gastropod mollusk in the family Ampullariidae , the apple snail family .
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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:
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