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On 1 December 1918 , three weeks later , he returned to his father 's house in the Dordogne to be reunited with his three brothers , who had all served in the army and survived the war .
 Dordogne
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dordogne