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The Orpheum Circuit was a chain of vaudeville and movie theater s. It was founded in 1886 and operated through 1927 when it was merged with the Keith-Albee theater chain , ultimately becoming part of the Radio-Keith-Orpheum ( RKO ) corporation .
 Radio-Keith-Orpheum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Radio-Keith-Orpheum