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Decades ago I never really understood how to use VI editor or how ATM AAL5 worked or how SSH authorized keys worked until I wrote it down and tried to teach a coworker. Ditto Kerberos, SSL, AFS, LDAP, BGP route priority list, DNS glue records, lisp lambda functions ...

For topics I'm an expert at, or at least an old timer, I'm well aware I'm worse at teaching those topics than someone who more recently learned and I wouldn't even bother trying to document or teach that stuff.

Find your edge, push a bit beyond it, chmod a+r your notebook, more or less.

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