content: --------------------------------------------------------------------------------
  -- MIT License
  --
  -- Copyright (C) 2024 Duck McSouls <quacksouls [AT] gmail [DOT] com>
  --
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  --------------------------------------------------------------------------------
  
  import Data.Foldable
  import Text.Printf
  
  -- | Some words in the English language that contain only consonants.
  word =
      [ "cry"
      , "crypt"
      , "cyst"
      , "glyph"
      , "gym"
      , "gypsy"
      , "ply"
      , "pwn"
      , "pygmy"
      , "sty"
      , "sync"
      , "syzygy"
      , "thy"
      , "try"
      , "tryst"
      , "why"
      , "wry"
      , "wyrm"
      ]
  
  -- | Whether a word has one or more vowels.
  hasVowel :: String -> Bool
  hasVowel str = or [s `elem` "aeiou" | s <- str]
  
  -- | Test words to see whether they have vowels.
  main = do
      let result = or $ map (\w -> hasVowel w) word
      printf "Any words have a vowel? %s\n" $ show result
      putStrLn "Test individual word for vowels"
      for_ word $ \w -> do
          printf "%s -> %s\n" w $ show . hasVowel $ w
      -- Is there any word in the list that does not use "Y"?
      let testY = any (\w -> 'y' `notElem` w) word
      let noY = filter (\w -> 'y' `notElem` w) word
      printf "Any words not using Y? %s\n" $ show testY
      printf "Words not using Y: %s\n" $ show noY
  