bugfix free

diff --git a/fp2/week45/camil/RefactorX.icl b/fp2/week45/camil/RefactorX.icl
index 3f273e0..9cbb6d7 100644 (file)
--- a/fp2/week45/camil/RefactorX.icl
+++ b/fp2/week45/camil/RefactorX.icl
@@ -46,7 +46,7 @@ free                                                          :: Expr -> [Name]
 free (NR _) = []\r
 free (VAR s) = [s]\r
 free (LET s _ e2) = [n \\ n <- free e2 | n <> s]\r
-free (OP e1 _ e2) = (free e1) ++ (free e2)\r
+free (OP e1 _ e2) = removeDup ((free e1) ++ (free e2))\r
 \r
 //     verwijder deelexpressies met ongebruikte let-variabelen:\r
 remove_unused_lets                                     :: Expr -> Expr\r