Question: Animation and Maplet

I would to get some ideas on how to write a maplet code that will animate step by step how to draw a rectangle ABCD: Draw side AB, and after this is done without removing side AB, draw side BC, and after this done without removing sides AB and BC, draw CD, and after this done without removing AB, BC and CD, draw DA. Although this is not really my problem, it is similar to the animation I am trying to create. Rectangle ABCD is constructed without user intervention. Thank you for any assistance you may come up with.
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