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Unlike pragmas that affect the `$^H' hints variable, the `use vars'
and `use subs' declarations are not BLOCK-scoped. They are thus
effective for the entire file in which they appear. You may not
rescind such declarations with `no vars' or `no subs'.
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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