Access Complex Hash

perl@1983 has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks, Can someone please tell me as to how to access "key3" and "key4" in below hash?

$hash = {
            key1 => {
                        key2 => {
                                  [ key3 => 'Hello' ],
                                  { key4 => 'World' },
                                }
                            }
                        };
[download]

Thanks in advance.

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