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He is most well-known , however , for his portrait of the man on the floor in Der sidder en Mand i en Sporvogn ( 1937 ) about a deroute during the economic crisis of the 1930 's .
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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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