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" Eristicophis " is a monotypic genus created for the venomous viper species , " Eristicophis macmahonii " , which is endemic to the desert region of Balochistan near the borders of Iran , Pakistan , and Afghanistan .
 Balochistan, Iran, Pakistan, Afghanistan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Balochistan, Iran, Pakistan, Afghanistan