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main :: IO ()
main = do
case "foo" of
('f':_) -> putStrLn "A"
('f':'o':_) -> putStrLn "B"
"bar" -> putStrLn "C"
case "foo" of
"foo" -> putStrLn "A"
"bar" -> putStrLn "B"
"baz" -> putStrLn "C"
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