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{-# LANGUAGE UnicodeSyntax #-}
module Main (main) where
import T2902_A_PairingSum
f :: Int -> PSum Int Int
f n = unions $ fmap g [1..n]
where
g m = unions $ fmap fromList
[ zip [m..n] $ repeat 1
, zip [m,2+m..n] $ repeat 2
, zip [m,3+m..n] $ repeat 3
]
main ∷ IO ()
main = print $ take 20 $ toList $ f 20
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