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Un-Thinkable ( I 'm Ready ) " spent twelve consecutive weeks atop the Billboard Hot R&B / Hip-Hop , the longest-running number-one single of 2010 , when the single was in its 12th week on top of the chart , Keys has completed a total of 54 weeks at # 1 on the chart .
 Keys
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Keys