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However , unlike his predecessors , he left no other known documents or relics mentioning his name , and he may have been one of several minor kings of Uruk added to the list , who reigned when hegemony was actually held by the first dynasty of Ur .
 Uruk, Ur
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Uruk, Ur