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Caught lobsters are graded as new-shell , hard-shell , or old-shell , and because lobsters which have recently shed their shells are the most delicate , an inverse relationship exists between the price of American lobster and its flavor .
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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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