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diff --git a/Haskell-book/15/Madness.hs b/Haskell-book/15/Madness.hs
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+module Madness where
+
+import Data.Monoid
+
+type Verb = String
+type Adjective = String
+type Adverb = String
+type Noun = String
+type Exclamation = String
+
+madlibbin' :: Exclamation
+           -> Adverb
+           -> Noun
+           -> Adjective
+           -> String
+madlibbin' e adv noun adj =
+    e <> "! he said " <>
+    adv <> " as he jumped into his car " <>
+    noun <> " and drove off with his " <>
+    adj <> " wife."
+
+madlibbinBetter' :: Exclamation
+                 -> Adverb
+                 -> Noun
+                 -> Adjective
+                 -> String
+madlibbinBetter' e adv noun adj =
+    mconcat [ e
+            , "! he said "
+            ,  adv
+            , " as he jumped into his car "
+            , noun
+            , " and drove off with his "
+            , adj
+            , " wife."
+            ]