36073
The siege was marked by constant sallies and attacks , but as it progressed , the Umayyad garrison 's morale collapsed and the internal divisions among the Qays and Yaman tribes began to manifest themselves .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None