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  1. or download this
      $hash{KEY}
  2. or download this
      $hash{'KEY'}
  3. or download this
      my %hash1 = ('TESTVALUE', 'OK');
  my %hash2 = (123,       , 1);
  4. or download this
      my %hash1 = (TESTVALUE() => 'OK');
  5. or download this
      my %hash1 = (TESTVALUE, 'OK');
  6. or download this
      $hash1{+TESTVALUE}
  7. or download this
      $hash1{TESTVALUE()}