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Abu Salih ' Abdallah ibn Muhammad ibn Yazdad al-Marwazi ( ) ( died 875 ) was a senior official of the Abbasid Caliphate in the mid-9th century .
 ibn, ibn, Abbasid Caliphate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 ibn, ibn, Abbasid Caliphate