58004
Beginning on November 26 , the series went nationwide on NBC until December 24 , after which it remained dormant until March 17 , 1950 when it was picked up by ABC until June 29 , 1951 .
 NBC, ABC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NBC, ABC