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#!/usr/bin/perl -w
use strict;
...

print join(", ", human(1..12, 14..21, 'aa'..'af', 'zz'..'aaf')), "\n";
print join(", ", human(1, 2, 3, 5, 7, 8, 9, 11, 14)), "\n";

1-12, 14-21, aa-af, zz-aaf
1-3, 5, 7-9, 11, 14