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He has also worked with Björn Ulvaeus 's group the Hootenanny Singers and ABBA , being sponsored as a Formula One driver by the latter .
 Björn Ulvaeus, Hootenanny Singers, ABBA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Björn Ulvaeus, Hootenanny Singers, ABBA