p22.hs

import Data.Bits

flaws :: [[Int]] -> [(Char,Char)]

flaws encoding = [(a,b) | (a, (primary:_)) <- tagged, (b, secondaries) <- tagged, 
                  not (any (primary <%) secondaries)]
  where 
    tagged = zip ['A'..'Z'] encoding  -- tag each row with alphabetic label
    (<%) u v = (u .&. v) == u         -- code u is overpunchable by code v

main = putStrLn ("flaws = " ++ (show (flaws kens_encoding)))
  where 
      kens_encoding = [
        [0x44, 0x0D, 0x0E, 0x31, 0x32, 0x34, 0x43, 0x78],   -- A
        [0x50, 0x07, 0x0B, 0x13, 0x1C, 0x2C, 0x4C, 0x63],   -- B
        [0x24, 0x16, 0x19, 0x23, 0x38, 0x45, 0x4A, 0x70],   -- C
        [0x42, 0x15, 0x1A, 0x26, 0x54, 0x69],               -- D
        [0x60, 0x25, 0x2A, 0x56, 0x59],                     -- E
        [0x41, 0x3D, 0x4E, 0x72],                           -- F
        [0x48, 0x3B, 0x47, 0x74],                           -- G 
        [0x00, 0x7F],                                       -- H
        [0x06, 0x35, 0x3A, 0x49, 0x52, 0x64],               -- I
        [0x05, 0x1E, 0x29, 0x51, 0x62, 0x6C],               -- J
        [0x12, 0x1D, 0x2E, 0x46, 0x58, 0x61],               -- K
        [0x0A, 0x39, 0x4D, 0x76],                           -- L
        [0x28, 0x1B, 0x5C, 0x67],                           -- M
        [0x22, 0x2D, 0x5E, 0x71],                           -- N
        [0x09, 0x27, 0x55, 0x5A, 0x68],                     -- O
        [0x01, 0x0F, 0x73, 0x7C],                           -- P
        [0x21, 0x36, 0x5D, 0x6A],                           -- Q
        [0x02, 0x3C, 0x57, 0x6B],                           -- R
        [0x04, 0x3E, 0x4B, 0x75],                           -- S
        [0x11, 0x6D, 0x7E],                                 -- T
        [0x14, 0x5B, 0x6F],                                 -- U
        [0x08, 0x17, 0x6E, 0x79],                           -- V
        [0x10, 0x1F, 0x65, 0x7A],                           -- W
        [0x18, 0x2B, 0x5F, 0x66],                           -- X
        [0x20, 0x33, 0x4F, 0x7D],                           -- Y
        [0x40, 0x77, 0x7B]]                                 -- Z