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In October , 1942 Piers commanded escort group C4 ( Restigouche and six corvettes ) which was to escort the slow convoy SC107 , from Sydney , Nova Scotia to Liverpool .
 Piers, Sydney , Nova Scotia, Liverpool
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Piers, Sydney , Nova Scotia, Liverpool