Export only values of Hanafuda.KoiKoi.Yaku used outside this module

src/Hanafuda/KoiKoi/Yaku.hs

@@ -1,5 +1,10 @@
 {-# LANGUAGE NamedFieldPuns #-}
-module Hanafuda.KoiKoi.Yaku where
+module Hanafuda.KoiKoi.Yaku (
+      Score
+    , Yaku(..)
+    , meldInto
+    , sumYakus
+  ) where
 
 import Hanafuda (Card(..), Monthly, Pack, add, contains, intersection, packOfCards, size)
 import Hanafuda.Player (Points)