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  1. or download this
      %A = (a => 1, b => 2, c => 3);
  %Z = (z => 9, y => 8, x => 7);
  2. or download this
      %combined = (%A, %Z);
  @all_keys = keys %combined;
  3. or download this
      @all_keys = keys %{{ %A, %Z }};
  4. or download this
      @all_keys = keys(%A, %Z);
  5. or download this
      @all_keys = keys((%A, %Z));
  @all_keys = keys(%temp::var = (%A, %Z));
  @all_keys = keys(my %temp = (%A, %Z));
  @all_keys = keys(do { %{{%A, %Z}} });
  6. or download this
      @all_keys = keys(%temp::var = (%A));
  @all_keys = keys(my %temp = (%A));
  @all_keys = keys(do { %{{%A}} });