90941
The disc wraps up with two songs that represent the beginning of Michael 's solo career in earnest with 1979 's " Do n't Stop 'Til You Get Enough " and the massive hit " Billie Jean , " released four years later .
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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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