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  1. or download this
      my $arrayElement = $$arrayRef[0];
  my $hashValue = $$hashRef{someKey};
  2. or download this
      my $arrayElement = ${$arrayRef}[0];
  my $hashValue = %{$hashRef}{key};
  3. or download this
      my $arrayElement = $arrayRef->[0];
  my $hashValue = $hashRef->{key};