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In winter the Ings support internationally important concentrations of waterfowl , in excess of 20,000 individuals , together with nationally important numbers of Bewick 's swan , teal , wigeon , mallard , pochard , golden plover and ruff .
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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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