18567
In pre-Abbasid times the western and eastern boundaries seem to have fluctuated , sometimes including what is now northern Syria to the west and Adiabene in the east .
 Syria, Adiabene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Syria, Adiabene