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Šeimynykštis ( plural : šeimynykščiai ) was a class of patriarchal slaves , who did the same job and lived under the same conditions as his master and family , in the early Grand Duchy of Lithuania .
 Grand Duchy of Lithuania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grand Duchy of Lithuania