diff --git a/notebooks/Alhazen.ipynb b/notebooks/Alhazen.ipynb
index 6fd212e9..7acc7c45 100644
--- a/notebooks/Alhazen.ipynb
+++ b/notebooks/Alhazen.ipynb
@@ -826,15 +826,6 @@
     "        return count"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from numpy import nanmax, isnan"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -878,10 +869,10 @@
     "\n",
     "        # Return maximum value encountered in tree, ignoring all NaNs\n",
     "        tree_values = [value] + [self.get_feature_value(c) for c in children]\n",
-    "        if all(isnan(tree_values)):\n",
+    "        if all(numpy.isnan(tree_values)):\n",
     "            return value\n",
     "        else:\n",
-    "            return nanmax(tree_values)"
+    "            return numpy.nanmax(tree_values)"
    ]
   },
   {
@@ -2901,7 +2892,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "generate_samples = generate_samples_advanced"
+    "GENERATE_SAMPLES = generate_samples_advanced"
    ]
   },
   {
@@ -2934,7 +2925,7 @@
     "\n",
     "print('--generating samples--')\n",
     "# samples = generate_samples(CALC_GRAMMAR, [testspec0, testspec1], 10)\n",
-    "samples = generate_samples(CALC_GRAMMAR, [testspec2], 10)\n",
+    "samples = GENERATE_SAMPLES(CALC_GRAMMAR, [testspec2], 10)\n",
     "samples"
    ]
   },
@@ -3120,7 +3111,7 @@
     "                print(f\"    {spec.friendly()}\")\n",
     "\n",
     "        # Step 4: Generate new inputs according to the new input specifications\n",
-    "        new_samples = generate_samples(self._grammar,\n",
+    "        new_samples = GENERATE_SAMPLES(self._grammar,\n",
     "                                       new_input_specifications,\n",
     "                                       self._generator_timeout)\n",
     "        if self._verbose:\n",
@@ -3523,7 +3514,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.8"
+   "version": "3.12.4"
   },
   "toc": {
    "base_numbering": 1,