#!/usr/bin/perl

use warnings;
use strict;

my %keys;

$keys{'C10'}->{'C10-1'}=1;
$keys{'C10'}->{'C10-2'}=1;
$keys{'C10'}->{'C10-20'}=1;
$keys{'C10'}->{'C10-3'}=1;

$keys{'C200'}->{'C200-1'}=1;
$keys{'C200'}->{'C200-20'}=1;
$keys{'C200'}->{'C200-3'}=1;
$keys{'C200'}->{'C200-21'}=1;

$keys{'C30'}->{'C30-1'}=1;
$keys{'C30'}->{'C30-2'}=1;
$keys{'C30'}->{'C30-30'}=1;
$keys{'C30'}->{'C30-4'}=1; 

sub sorted { 
    return map { $_->[0] }
        sort { 
            $a->[1] <=> $b->[1] ||
            $a->[2] <=> $b->[2]
        } map { [ $_, split("-", substr($_,1)) ] } @_;
}

foreach my $key (sorted(keys %keys)) {
    print "'$key' => ", $keys{$key}, "\n";
    foreach my $subkey (sorted(keys %{$keys{$key}})) {
        print "   '$subkey' => $keys{$key}->{$subkey}\n";
    }
}