diff --git a/ch07/01_main-chapter-code/exercise-solutions.ipynb b/ch07/01_main-chapter-code/exercise-solutions.ipynb
index c2af155..4d7b125 100644
--- a/ch07/01_main-chapter-code/exercise-solutions.ipynb
+++ b/ch07/01_main-chapter-code/exercise-solutions.ipynb
@@ -181,29 +181,6 @@
     "tokenizer = tiktoken.get_encoding(\"gpt2\")"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "id": "b319df48-8a14-4beb-966c-6b49e255c6ba",
-   "metadata": {},
-   "source": [
-    "In addition, we have to make sure that we use the `format_input_phi` function: "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "ed41ec0e-6a5a-44f1-bb3c-b7d0724cb4e1",
-   "metadata": {},
-   "source": [
-    "```python\n",
-    "    train_losses, val_losses, tokens_seen = train_model_simple(\n",
-    "        model, train_loader, val_loader, optimizer, device,\n",
-    "        num_epochs=num_epochs, eval_freq=5, eval_iter=5,\n",
-    "        start_context=format_input_phi(val_data[0]), # New: `Use format_input_phi` function\n",
-    "        tokenizer=tokenizer\n",
-    "    )\n",
-    "```"
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "e0650926-c39f-4442-8116-cb7494416f28",