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This approach has been echoed by Lev Landau and Evgeny Lifshitz , and others , and has become standard .
 Lev Landau, Evgeny Lifshitz
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 Landau, Evgeny Lifshitz