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  1. or download this
      DB<166> %hash = (Canberra => { 12 => 1}, Canberra => { 18 => 1} )
 => ("Canberra", { 18 => 1 })
  2. or download this
      DB<178> sub join_deep {
             my %hash;
...

  DB<179> %h =join_deep (Canberra => { 12 => 1}, Canberra => { 18 => 1
+} )
 => ("Canberra", { 12 => 1, 18 => 1 })