#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dumper;


my %petsounds = (
    "cat" => "meow",
    "dog" => "woof",
    "snake" => "hiss"
);


print "The cat goes " . $petsounds{"cat"} . ".\n";


$petsounds{"mouse"} = "squeak!";
$petsounds{"dog"} = "arf!";


delete($petsounds{"cat"});


print "The mouse goes " . $petsounds{"mouse"} . ".\n";


print Dumper(\%petsounds) . "\n";


my %a = ();
$a{1}{"a"}{"A"} = "FIRST";
$a{1}{"c"}{"B"} = "THIRD";
$a{1}{"b"}{"C"} = "SECOND";

foreach my $k1 (sort keys %a) {
    foreach my $k2 (sort keys %{$a{$k1}}) {
        foreach my $k3 (sort keys %{$a{$k1}{$k2}}) {
            print "$k1\t$k2\t$k3\t$a{$k1}{$k2}{$k3}\n";
        }
    }
}

print Dumper(\%a);


1;
__END__