7618
Initially , this was done by a system of red dots , said to have been commissioned in the Umayyad era by Abu al-Aswad al-Du ' ali a dot above = " , a dot below = " , a dot on the line = " , and doubled dots indicated nunation .
 person: Abu al-Aswad al-Du ' ali
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Abu al-Aswad al-Du ' ali