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    if(not defined($coord_{$key1}{$key2}[2]))
 {
   $coord_{$key1}{$key2}[2] = 0;
 }
  2. or download this
    $coord_{$key1}{$key2}[2] = 0 unless defined $coord_{$key1}{$key2}[2];
  3. or download this
    $coord_{$key1}{$key2}[2] ||= 0;