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I quoted the top of the ASCII table to emphasize that these numbers characters were mapped to were not at all abstract, they were intended to be sent down a teletype wire (and the reason ASCII left the 8-bit unused was so it could be used for parity checking).

Also, the NUL charcter plays an important role in our story, because it was used as a string terminator in the C/Unix world. More on that later.

Anyway: uppercase, lowercase, some punctuation... what else more could you need?
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