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He had his first competitive bout ( s ) aged 13 years at the 1995 C.I.S. Junior Muaythai Championships winning a silver medal at the event in Odessa , Ukraine .
 Odessa , Ukraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Odessa , Ukraine