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He followed up the release of his debut album with his first headlining tour , the My World Tour , the remix albums My Worlds Acoustic and Never Say Never – The Remixes , and the 3D biopic-concert film Justin Bieber : Never Say Never .
 Justin Bieber
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Justin Bieber