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Since then , Rowland worked on a number of collaborations with European singers ; most notably French singer Nâdiya , Italian singer Tiziano Ferro , and French DJ David Guetta .
 Nâdiya, Tiziano Ferro, David Guetta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nâdiya, Tiziano Ferro, David Guetta