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In The Goon Show the cast was usually only the three principals , who would pretend to try to sound like a larger group by repeating " rhubarb " very quickly but clearly , with outbreaks of " Custard ! "
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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