diff --git a/uebung_04/exercise_06 b/uebung_04/exercise_06
new file mode 160000
index 0000000..915b415
--- /dev/null
+++ b/uebung_04/exercise_06
@@ -0,0 +1 @@
+Subproject commit 915b4158dedeb7600f07c52c6c29d138512ffd46