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The PPD ( Pistolet-Pulemyot Degtyaryova , Russian : Пистолет-пулемёт Дегтярёва , Degtyaryov machine pistol ) is a submachine gun originally designed in 1934 by Vasily Degtyaryov .
 Degtyaryov, Vasily Degtyaryov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Degtyaryov, Vasily Degtyaryov