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Tschomakova represented Bulgaria at the 2012 Summer Olympics in London , where she competed as the nation 's lone fencer in the women 's individual sabre event .
 Tschomakova, London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tschomakova, London