my %joined_FS;
my %outer_keys;
for my $var (($VAR1, $VAR2))
{
    if (ref $var eq "HASH")
    {
        while (my($key, $value) = each %$VAR1)
        {
            $outer_keys{$key} = $value;
        }
    }
    elsif (ref $var eq "ARRAY")
    {
        for my $href (@$var)
        {
            my  @unq_keys = keys %$href;
            for my $key (@unq_keys)
            {
                if (!exists $outer_keys{$key})
                {
                    $outer_keys{$key} = $href->{$key};
                }
                else
                {
                    while (my($k, $v) = each %{$href->{$key}})
                    {
                        $outer_keys{$key}->{$k} = $v;
                    }
                }
            }
        }
    }
}
print Dumper \%outer_keys;