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After rediscovering his original artistic roots , Andrej was also preparing a rock album , Libero , in cooperation with Drago Mlinarec , Ciril Sem on percussion instruments , Matjaž Krivec on contra bass , Dejan Berden on piano and harmonica , and Peter Jan on solo guitar .
 Andrej
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Andrej