revert changes

Signed-off-by: Thijs Baaijen <[email protected]>

Author: Thijss

power-grid-model-ds/introduction.ipynb

@@ -79,25 +79,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "id": "6ada3e60-8bd7-4687-9f29-3ae5ff029228",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# %load solutions/introduction_1_1_define_array_extensions\n",
-    "# SPDX-FileCopyrightText: 2025 Contributors to the Power Grid Model project <[email protected]>\n",
-    "#\n",
-    "# SPDX-License-Identifier: MPL-2.0\n",
-    "\n",
-    "class MyNodeArray(NodeArray):\n",
-    "    _defaults = {\"x\": 0.0, \"y\": 0.0, \"u\": 0.0}\n",
-    "    x: NDArray[np.float64]\n",
-    "    y: NDArray[np.float64]\n",
-    "    u: NDArray[np.float64]\n",
-    "\n",
-    "class MyLineArray(LineArray):\n",
-    "    _defaults = {\"i_from\": 0.0}\n",
-    "    i_from: NDArray[np.float64]"
+    "# %load solutions/introduction_1_1_define_array_extensions"
    ]
   },
   {