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Officially National Children 's Library named after Khnko Aper ( ) is a national children 's library in Yerevan , Armenia .
 location: Yerevan; location: Armenia
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:
 location: Yerevan; location: Armenia