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While they were away the land boom turned to bust , and with the failure of the Commercial Bank of South Australia , he lost much of his fortune and was forced to relinquish his mansion to the AMP Society and find employment in the office of E. Benda and Co. of Grenfell Street .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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