How to animate blinking eyes - clip from class

Hey! this is a clip from my class on how to create a looping animation for a character. Its the first class I've made so let me know what you think.

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Music Attribution:
Creative Commons CC BY-SA 3.0

Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)

[KatieCloverArt]

If I didn't say this in the tutorial clip, the way to make expressions on a layer is to hold down alt (or option on mac) and click the stopwatch. after that I typed in loopOut() to make the key frames loop endlessly.