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In February 2010 he was unveiled as new head coach of Serie B strugglers Triestina , replacing Mario Somma .
 Serie B, Triestina, Mario Somma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Serie B, Triestina, Mario Somma