diff --git a/13-a.hs b/13-a.hs
index fe01386..93244bc 100644
--- a/13-a.hs
+++ b/13-a.hs
@@ -1,4 +1,3 @@
-import Prelude
 import Data.List.Split (splitOn)
 import Data.Char (isNumber)
 import Data.List (elemIndices)
diff --git a/13-b.hs b/13-b.hs
index 097abeb..0e728fb 100644
--- a/13-b.hs
+++ b/13-b.hs
@@ -1,11 +1,5 @@
-import Prelude
-import Data.List.Split (splitOn)
 import Data.Char (isNumber)
-import Data.List (sortBy, findIndices, intercalate)
-
-{- cabal:
-build-depends: base, split
--}
+import Data.List (sortBy, findIndices)
 
 data Node = List [Node] | Num Int
   deriving (Eq, Show)