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perl -e 'print 123; print 456; print $]'
This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-li
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.
Results (219 votes),