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History World War I The 1st Brigade was raised in Sydney , New South Wales , shortly after the start of World War I in August 1914 for service overseas as part of the Australian Imperial Force ( AIF ) .
 1st Brigade, Sydney , New South Wales, Australian Imperial Force
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 1st Brigade, Sydney , New South Wales, Australian Imperial Force