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Diaz and Rosenberg ( 1 ) would classify Limfjorden as periodically hypoxic , although we have found it difficult to create a statistically robust indicator that would classify systems as periodically hypoxic .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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