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There are the " Nestorian " churches resulted from the reaction of the Council of Ephesus ( 431 ) , which are the earliest surviving Eastern Christian churches that keep the faith of only the first two ecumenical councils , i.e. , the First Council of Nicaea ( 325 ) and the First Council of Constantinople ( 381 ) as legitimate .
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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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