Looks to me like a character cell scan & print/animate routine, eg it scans the attributes of the intended print areas, and then animates the cells if it finds it can, otherwise it tries again, which would add a "random" offset between the animations.
I could be wrong of course and probably am.......it could also be precalculated, but I aint got time to watch it.
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I could be wrong of course and probably am.......it could also be precalculated, but I aint got time to watch it.