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Other animation studios such as Hanna-Barbera were selling shows to the networks , even as the series produced by Terrytoons ( which was owned by CBS ) were declining in popularity .
 Hanna-Barbera, Terrytoons, CBS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hanna-Barbera, Terrytoons, CBS