This was also an attempt at figuring out how to make a decently-looped animation.
1. determine at which point you want the video to stop -- in this case, when the slower moving arc extreme reaches zero degrees
2. add an if-condition that, when met, prints the value of FRAME; and now you have the number of frames to output
3. "sbot-export-video arcs.bot --framenumber <frames> arcs.mp4" and you're done
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