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      (?:
        \1 (?:
    ...
          $ (?{ print join(" ", map .5 * length, $3 x 2, $1 x 3, $2 x 4), 
    +"\n" })
        )
      )
    
  2. or download this
    1220 1320 1420
    1220 1980 2840
    
  3. or download this
      (?:
        \1 (?:
    ...
          $ (?{ print join(" ", map .5 * length, $1 x 2, $2 x 3, $3 x 4), 
    +"\n" })
        )
      )