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The land immediately north of the Oxus was called Transoxiana and also Sogdia , especially when referring to the Sogdian merchants who dominated the silk road trade .
 Oxus, Transoxiana, Sogdia, Sogdian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oxus, Transoxiana, Sogdia, Sogdian