diff --git a/2020/day17/day17.hs b/2020/day17/day17.hs
index c20b113..53e0b4d 100644
--- a/2020/day17/day17.hs
+++ b/2020/day17/day17.hs
@@ -11,6 +11,7 @@ main = do
   input <- lines <$> readFile "input"
   let a = toVec input
       _ = a :: [V4 Int]
+--      _ = a :: [V3 Int]
   print $ day17 a
 
 day17 = length . flip (!!) 6 . iterate step