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  1. or download this
    my $key3 = $hash{$key1}{$key2};
  2. or download this
    my $value = $hash{$key1}{$key2}{$key3};
  3. or download this
    %hash = ( key1 => { key2 => $some_key } );
%hash = ( key1 => { key2 => { $some_key => $some_value } } );