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The attack on Dunkirk was a combination of both of these types of operation , aimed at a powerful French frigate squadron at anchor in Dunkirk harbour .
 Dunkirk, Dunkirk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dunkirk, Dunkirk