182874
The Samanid army soon left Gurgan , returning to Khurasan , but Qabus found the support of al-Hasan ibn al-Fairuzan , who was ruling in Simnan at that time .
 Gurgan, Khurasan, Qabus, Simnan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gurgan, Khurasan, Qabus, Simnan