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Biography J. Ornstein 's maternal grandparents , the Aisinmans , founded and controlled Petrol-Block , the London and Paris listed energy group operating in Ploiesti , Romania , a region which was then the world 's third oil exporter and the main source of oil in Europe in the early 1900s ' , besides Baku in Russia .
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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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