It is definitely more fun if you *don't* use Set::IntSpan...
#!/usr/bin/perl
use strict;
use warnings;
use Set::IntSpan;
my @array = ("1", "2", "3", "5", "6", "7", "9");
my $set = Set::IntSpan->new(\@array);
my $out = join(',', $set->D($set->holes()));
print $out, "\n";
OUTPUT:
1-3,5-7,9
*My* tenacity goes to eleven...
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