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He is most notable for his support of the Yaman tribes in the conflict with the Qays who dominated the administration under his predecessor and successor , as well as for his reputation for un-Islamic beliefs and atheism ( zindiq ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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