diff --git a/week4/community-contributions/philip/week4_EXERCISE.ipynb b/week4/community-contributions/philip/week4_EXERCISE.ipynb
index 039e2e2..c6f0e82 100644
--- a/week4/community-contributions/philip/week4_EXERCISE.ipynb
+++ b/week4/community-contributions/philip/week4_EXERCISE.ipynb
@@ -60,14 +60,14 @@
     },
     {
       "cell_type": "code",
-      "execution_count": null,
+      "execution_count": 24,
       "metadata": {},
       "outputs": [
         {
           "name": "stdout",
           "output_type": "stream",
           "text": [
-            "Configured 3 models\n",
+            "Configured 2 models\n",
             "OpenRouter models available (perfect for limited storage demos!)\n"
           ]
         }
@@ -126,7 +126,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 19,
+      "execution_count": 22,
       "metadata": {},
       "outputs": [],
       "source": [
@@ -170,6 +170,7 @@
         "- Tests for any bugs that were identified\n",
         "\n",
         "Return ONLY Python code with pytest tests. Include the original code at the top if needed.\n",
+        "Put the imports at the top of the file first.\n",
         "Do not include explanations or markdown formatting.\"\"\"\n"
       ]
     },
@@ -486,21 +487,21 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 21,
+      "execution_count": 23,
       "metadata": {},
       "outputs": [
         {
           "name": "stdout",
           "output_type": "stream",
           "text": [
-            "* Running on local URL:  http://127.0.0.1:7883\n",
+            "* Running on local URL:  http://127.0.0.1:7884\n",
             "* To create a public link, set `share=True` in `launch()`.\n"
           ]
         },
         {
           "data": {
             "text/html": [
-              "<div><iframe src=\"http://127.0.0.1:7883/\" width=\"100%\" height=\"500\" allow=\"autoplay; camera; microphone; clipboard-read; clipboard-write;\" frameborder=\"0\" allowfullscreen></iframe></div>"
+              "<div><iframe src=\"http://127.0.0.1:7884/\" width=\"100%\" height=\"500\" allow=\"autoplay; camera; microphone; clipboard-read; clipboard-write;\" frameborder=\"0\" allowfullscreen></iframe></div>"
             ],
             "text/plain": [
               "<IPython.core.display.HTML object>"
@@ -513,9 +514,47 @@
           "data": {
             "text/plain": []
           },
-          "execution_count": 21,
+          "execution_count": 23,
           "metadata": {},
           "output_type": "execute_result"
+        },
+        {
+          "name": "stderr",
+          "output_type": "stream",
+          "text": [
+            "Traceback (most recent call last):\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\gradio\\queueing.py\", line 745, in process_events\n",
+            "    response = await route_utils.call_process_api(\n",
+            "               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\gradio\\route_utils.py\", line 354, in call_process_api\n",
+            "    output = await app.get_blocks().process_api(\n",
+            "             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\gradio\\blocks.py\", line 2116, in process_api\n",
+            "    result = await self.call_function(\n",
+            "             ^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\gradio\\blocks.py\", line 1623, in call_function\n",
+            "    prediction = await anyio.to_thread.run_sync(  # type: ignore\n",
+            "                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\anyio\\to_thread.py\", line 56, in run_sync\n",
+            "    return await get_async_backend().run_sync_in_worker_thread(\n",
+            "           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\anyio\\_backends\\_asyncio.py\", line 2485, in run_sync_in_worker_thread\n",
+            "    return await future\n",
+            "           ^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\anyio\\_backends\\_asyncio.py\", line 976, in run\n",
+            "    result = context.run(func, *args)\n",
+            "             ^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"c:\\Users\\Philo Baba\\llm_engineering\\.venv\\Lib\\site-packages\\gradio\\utils.py\", line 915, in wrapper\n",
+            "    response = f(*args, **kwargs)\n",
+            "               ^^^^^^^^^^^^^^^^^^\n",
+            "  File \"C:\\Users\\Philo Baba\\AppData\\Local\\Temp\\ipykernel_43984\\2272281361.py\", line 7, in review_code\n",
+            "    bugs_result = detect_bugs(code, model_key)\n",
+            "                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
+            "  File \"C:\\Users\\Philo Baba\\AppData\\Local\\Temp\\ipykernel_43984\\638705449.py\", line 23, in detect_bugs\n",
+            "    model_config = MODELS[model_key]\n",
+            "                   ~~~~~~^^^^^^^^^^^\n",
+            "KeyError: 'deepseek-coder-v2-openrouter'\n"
+          ]
         }
       ],
       "source": [