I'd argue there's a fifth character missing from the ZX-81 set. Notice how
there are two separate MEDIUM SHADEs, one the inverse of the other. For
complete compatibility Unicode would also somehow need a second one of
those.
It has come to my attention that there are four semi-graphics characters from
the ZX-81 character set that are currently un-encoded:
https://en.wikipedia.org/wiki/File:ZX81.chars.00-0A.80-8A.png
[https://en.wikipedia.org/wiki/File:ZX81.chars.00-0A.80-8A.png]the last four
characters on the
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