It stops you from accidentally producing two headers. Like, if you're calling some function that prints the header, and you are calling it yourself, you only want the first call to mean anything.
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Jeff[japhy]Pinyan:
Perl,
regex,
and perl
hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;
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