Well, it would depend on how complicated your logo is, and how you want to sequence it. If it was a pen drawing a circle, then text inside of it, you would draw your logo and erase just a bit, in the last part drawn. On you erase a bit, insert a keyframe. Keep doing this until you get to the point when you click play, you see your animation backwords. Then just reverse the frames. If you want a pen to draw it, you would draw a pen at the right angle and set the registration point to the tip. Copy your finished logo** line** to a new layer and set to guide.
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