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He was replaced before an Eastern European tour , which included concerts in Zagreb , Belgrade , Sofia and Plovdiv , by Tommy Vommit , the name being given to him by Rich van Kerr after a heavy night of drinking .
 Zagreb, Belgrade, Sofia, Plovdiv
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zagreb, Belgrade, Sofia, Plovdiv