The most important thing for this tutorial is to design a character in Adobe Illustrator with a perfectly straight line. As the CC Split 2 effect in Adobe After Effects only allows to place 2 control points one beside the other, it would not be possible to control a curved (smiling) mouth.
It is also important to import the Illustrator file within After Effects as a composition, so that the layer below can be displayed when the mouth is open.
The most difficult part is to link the expression value of CC
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