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Polygonum amphibium ) is a species of flowering plant in the knotweed family known by several common names , including longroot smartweed , water knotweed , water smartweed , and amphibious bistort .
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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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