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Furthermore , his person was usually associated with the Bulgarian football championship especially when it comes to the big derby between Levski FC and CSKA .
 Bulgarian football championship, Levski FC, CSKA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bulgarian football championship, Levski FC, CSKA