Assertion: episode | /r/CreatedBy | series co-creator trey parker
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Source sentences:
text: The episode was written by series co-creator Trey Parker and is rated TV-MA in the United States, except on syndicated broadcasts, where the episode is rated TV-14, instead.
text: Written by series co-creator Trey Parker and directed by animation director Eric Stough, "Butters' Very Own Episode" was rated TV-MA in the United States, and originally aired on December 12, 2001 on Comedy Central.