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  1. or download this
           if (@array[3,4] ^=~ /\S/) { ... }
  2. or download this
    if (@array[3] =~ /\S/, @array[4] =~ /\S/) { ... }
  3. or download this
    if (any(@array[3,4]) =~ /\S/) {...}
  4. or download this
    if (all(@array[3,4]) =~ /\S/) {...}