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The conference adopted a Declaration drafted by Lev Ponomaryov , Sergei Kovalev , Viktor Sheinis et al. .
 Lev Ponomaryov, Sergei Kovalev, Viktor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lev Ponomaryov, Sergei Kovalev, Viktor