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He completed this enterprising series of 475 prints from some twenty different compositions and sent them to the dealer Ambroise Vollard , despite not compromising to his request for salable , conformed work .
 Ambroise Vollard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ambroise Vollard