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Jonna Christensen ( née Pirinen , born 28 December 1982 ) , better known by her stage name Jonna , is a pop and R&B singer/songwriter from Finland .
 Jonna, Pirinen, Jonna, Finland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jonna, Pirinen, Jonna, Finland