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The first mail forwarding service was established in 1826 in Baku , followed by the second mail forwarding service which was established in 1828 in Nakhichevan .
 Baku, Nakhichevan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baku, Nakhichevan