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In 2004 , MCBA served as a partner in the Walker Art Center 's " Walker Without Walls " as a satellite location for No Reading Required , an exhibition of artists ' books from the Walker 's library collection .
 organization: Walker Art Center; organization: Walker; organization: Walker
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Walker Art Center, Walker, Walker 
Answer:
 organization: Walker Art Center; organization: Walker; organization: Walker