1920
Experimental studies into the effectiveness of AA have been based either on results obtained from individuals attending meetings run under the umbrella of the AA organisation itself , or from similar twelve-step recovery programmes based on the twelve-step approach run externally from the AA organisation ; generically termed , in this latter case , as twelve-step facilitation ( TSF ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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