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  (?:
    \1 (?:
...
      $ (?{ print join(" ", map .5 * length, $3 x 2, $1 x 3, $2 x 4), 
+"\n" })
    )
  )

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1220 1980 2840

  (?:
    \1 (?:
...
      $ (?{ print join(" ", map .5 * length, $1 x 2, $2 x 3, $3 x 4), 
+"\n" })
    )
  )