• Just like unique numbers:

    From vvvvvvvvvvvvvvvvv@vvvvvvvvvvvvvvvvv@mail.ee to comp.programming on Mon Aug 28 00:48:50 2023
    From Newsgroup: comp.programming

    groups.google.com/g/ee.prog/c/EyCb7BwYfaI
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