1 files changed, 3 insertions, 0 deletions
diff --git a/Util.hs b/Util.hs
index 11b5658..9c3fbf0 100644
--- a/Util.hs
+++ b/Util.hs
@@ -1,5 +1,8 @@
+{-# LANGUAGE TupleSections #-}
 module Util where
 
+import Data.Function (on)
+import Data.List
 import qualified Data.Map.Strict as Map