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In 2006 the Comedy Unit to RDF Media Group and Gilbert 's most recent credits have been Empty with Gregor Fisher and Billy Boyd , the revival of Rab C Nesbitt after a 10 year gap and exec producing on Gary Tank Commander written by and starring Greg McHugh .
 Comedy Unit, Gilbert, Gregor Fisher, Billy Boyd, Greg McHugh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Comedy Unit, Gilbert, Gregor Fisher, Billy Boyd, Greg McHugh