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diff --git a/Haskell-book/27/StrictList.hs b/Haskell-book/27/StrictList.hs
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+++ b/Haskell-book/27/StrictList.hs
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+{-# LANGUAGE Strict #-}
+
+module StrictList where
+
+data List a =
+    Nil
+  | Cons ~a ~(List a)
+  deriving (Show)
+
+take' n _ | n <= 0 = Nil
+take' _ Nil = Nil
+take' n (Cons x xs) = (Cons x (take' (n - 1) xs))
+
+map' _ Nil = Nil
+map' f (Cons x xs) = (Cons (f x) (map' f xs))
+
+repeat' x = xs where xs = (Cons x xs)
+
+main = do
+    print $ take' 10 $ map' (+1) (repeat' 1)