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print //; # pattern-match an empty string. result: 1
print \\//; # ref to ref to variable holding 1 (1)
print \\\//; # ref to ref to ref to variable holding 1 (2)
print \\///\\\//; # print (1) / (2)
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 (185 votes),