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"Intro to Knots" is the tenth episode of the fourth season of the NBC sitcom Community, which originally aired on April 18, 2013.The episode was written by Andy Bobrow and directed by Tristram Shapeero.
The episode features the study group gathering around for Christmas at Jeff's apartment as they try to convince their history professor to change their grade. Malcolm McDowell guest-stars as Professor Cornwallis.

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