diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..5ff7fee
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "40 Extras/OOP/die_einen_da"]
+	path = 40 Extras/OOP/die_einen_da
+	url = git@collaborating.tuhh.de:e-24/courses/oop/exo/2026/g08/die_einen_da.git
diff --git a/.obsidian/app.json b/.obsidian/app.json
index 26b1465..c99326f 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -9,7 +9,5 @@
     "downscalePercent": 100
   },
   "promptDelete": false,
-  "newFileLocation": "folder",
-  "newFileFolderPath": "00 Inbox",
   "showUnsupportedFiles": true
 }
\ No newline at end of file
diff --git a/.obsidian/plugins/obsidian-file-color/data.json b/.obsidian/plugins/obsidian-file-color/data.json
index 587ba26..aeb5ea2 100644
--- a/.obsidian/plugins/obsidian-file-color/data.json
+++ b/.obsidian/plugins/obsidian-file-color/data.json
@@ -1,5 +1,5 @@
 {
-  "cascadeColors": false,
+  "cascadeColors": true,
   "colorBackground": false,
   "palette": [],
   "fileColors": []
diff --git a/40 Extras/OOP/die_einen_da b/40 Extras/OOP/die_einen_da
new file mode 160000
index 0000000..51d61bf
--- /dev/null
+++ b/40 Extras/OOP/die_einen_da	
@@ -0,0 +1 @@
+Subproject commit 51d61bfb53fadba7ff55749f125aef9b8129e4b9