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In June 2006 , drummer Mikko Herranen left the band to focus on his other band RUST .
 person: Mikko Herranen; organization: RUST
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Mikko Herranen; organization: RUST