There is another serious problem:
Characters sharing the same glyph, but being different.
In Russia, users of TeX got annoyed when they got the error message
unknown command sequence when they had typed in \TeX. It is known
if and only if all three letters are latin. There are 8 possible
spellings of TeX, 7 of them invalid. Greek adds more possibilities,
if you allow for capital letters. Forcing lowercase makes the situation
better, but does not resolve it completely ("a", "e", "y" latin/cyrillic;
"o" latin/cyrillic/greek are examples).
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