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Ptolemy ( AD 90-168 ) , in his Geography , Chapter 15.3 A , refers to Kashgar as “ Kasia ” .
 Ptolemy, Kashgar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ptolemy, Kashgar