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Hanttu is also involved with Finnvox Studios in Helsinki , which has worked with artists such as Nightwish , Reflexion , Soulrelic and the Belarusian 2009 Eurovision Song Contest entry Petr Elfimov .
 Hanttu, Finnvox Studios, Helsinki, Petr Elfimov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hanttu, Finnvox Studios, Helsinki, Petr Elfimov