190511
Because betting with on-track bookmaker s could not be easily scrutinised by law enforcement or taxation authorities , it was relatively easy for such people to claim that any large large sums of money they might possess had been won on a lucky bet , and it was extremely difficult for the authorities to prove otherwise .
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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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