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#/usr/bin/perl -w
use warnings;
...
$|++;
$_=unpack("B*", pack ("H36","ab5cf4fa1bafd28972fb0972b3ea218eb972"));
while (/(\d{6})/g){print pack ("B*","$[$|$1");}

my @foo = ("just anoth"," perl hack", "");
print join "er",@foo;