17518
The cities of Herat , Kandahar , Balkh , and Zaranj are also very historic .
 Herat, Kandahar, Balkh, Zaranj
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Herat, Kandahar, Balkh, Zaranj