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Brigadier-General W. Thuillier assumed command on 8 September 1915 and established his headquarters at Westcliff-on-Sea , later moving to Southminster .
 Westcliff-on-Sea, Southminster
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Westcliff-on-Sea, Southminster