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Defeated , Abu Talha soon sought Samanid and the Saffarid aid , and in 885 he was left as the Saffarid deputy for Khurasan , while Amr turned again west to face the Abbasid regent , al-Muwaffaq , in his attempts to recover Fars .
 Khurasan, Amr, Abbasid, Fars
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Khurasan, Amr, Abbasid, Fars