diff --git a/for-loops.ipynb b/for-loops.ipynb
index d8dc735..a35b671 100644
--- a/for-loops.ipynb
+++ b/for-loops.ipynb
@@ -304,11 +304,78 @@
     "\n",
     "Matthes 2023, p. 67, Exercise 4-13."
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Ramen\n",
+      "Udon\n",
+      "Sushi\n",
+      "Onigiri\n",
+      "Matcha\n"
+     ]
+    }
+   ],
+   "source": [
+    "menu = \"Ramen\", \"Udon\", \"Sushi\", \"Onigiri\", \"Matcha\"\n",
+    "for food_item in menu:\n",
+    "    print(food_item)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "TypeError",
+     "evalue": "'tuple' object does not support item assignment",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
+      "Cell \u001b[0;32mIn[2], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mmenu\u001b[49m\u001b[43m[\u001b[49m\u001b[38;5;241;43m0\u001b[39;49m\u001b[43m]\u001b[49m \u001b[38;5;241m=\u001b[39m \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mNOT RAMEN\u001b[39m\u001b[38;5;124m\"\u001b[39m\n",
+      "\u001b[0;31mTypeError\u001b[0m: 'tuple' object does not support item assignment"
+     ]
+    }
+   ],
+   "source": [
+    "menu[0] = \"NOT RAMEN\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Takoyaki\n",
+      "Udon\n",
+      "Sushi\n",
+      "Onigiri\n",
+      "Mochi\n"
+     ]
+    }
+   ],
+   "source": [
+    "menu = \"Takoyaki\", \"Udon\", \"Sushi\", \"Onigiri\", \"Mochi\"\n",
+    "for food_item in menu:\n",
+    "    print(food_item)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": ".venv",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -322,7 +389,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.7"
+   "version": "3.12.1"
   }
  },
  "nbformat": 4,