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Yeah, but how are you going to read the punch cards?

That'd depend a lot on how many I needed to read, & how often. If I just
needed to do it once, & I'd build an optical reader from scratch, & feed
the cards by hand, (or pay a student/unemployed-person to feed them for
me).

Ach, you don't have to build a reader from scratch. Bulk-load a stacking
scanner and use OMR and a little BASIC.