diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..1bd7fca 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,11 +43,152 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "3386b41f",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "=== Initialize Inventory ===\n",
+      "\n",
+      "=== Take Customer Orders ===\n",
+      "\n",
+      "=== Update Inventory ===\n",
+      "- 't-shirt' deducted by 1. New stock: 4\n",
+      "\n",
+      "=== Order Statistics ===\n",
+      "- Total unique products ordered: 1\n",
+      "- % of unique catalog ordered: 20.00%\n",
+      "\n",
+      "=== Updated Inventory ===\n",
+      "- t-shirt: 4\n",
+      "- mug: 2\n",
+      "- hat: 3\n",
+      "- book: 1\n",
+      "- keychain: 4\n"
+     ]
+    }
+   ],
+   "source": [
+    "def initialize_inventory(products):\n",
+    "    \"\"\"\n",
+    "    Ask the user for a starting quantity for each product.\n",
+    "    Returns a dictionary like: {'t-shirt': 5, 'mug': 3, ...}\n",
+    "    \"\"\"\n",
+    "    inventory = {}\n",
+    "    print(\"\\n=== Initialize Inventory ===\")\n",
+    "    for p in products:\n",
+    "        while True:\n",
+    "            raw = input(f\"Enter the quantity of '{p}': \").strip()\n",
+    "            if raw.isdigit():\n",
+    "                inventory[p] = int(raw)\n",
+    "                break\n",
+    "            else:\n",
+    "                print(\"Please enter a non-negative integer (e.g., 0, 1, 2, ...).\")\n",
+    "    return inventory\n",
+    "\n",
+    "\n",
+    "def get_customer_orders():\n",
+    "    \"\"\"\n",
+    "    Interactively collect product names from the user.\n",
+    "    Returns a set of unique product names the customer wants.\n",
+    "    \"\"\"\n",
+    "    customer_orders = set()\n",
+    "    print(\"\\n=== Take Customer Orders ===\")\n",
+    "    while True:\n",
+    "        item = input(\"Enter a product name (or press Enter to stop): \").strip().lower()\n",
+    "        if item == \"\":\n",
+    "            \n",
+    "            break\n",
+    "        customer_orders.add(item)\n",
+    "\n",
+    "        \n",
+    "        while True:\n",
+    "            another = input(\"Add another product? (yes/no): \").strip().lower()\n",
+    "            if another in (\"yes\", \"no\", \"y\", \"n\"):\n",
+    "                break\n",
+    "            print(\"Please type 'yes' or 'no'.\")\n",
+    "        if another in (\"no\", \"n\"):\n",
+    "            break\n",
+    "\n",
+    "    return customer_orders\n",
+    "\n",
+    "\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    \"\"\"\n",
+    "    For each product the customer ordered (unique), deduct 1 from inventory if available.\n",
+    "    If a product doesn't exist or is out of stock, show a helpful message.\n",
+    "    \"\"\"\n",
+    "    print(\"\\n=== Update Inventory ===\")\n",
+    "    for item in customer_orders:\n",
+    "        if item not in inventory:\n",
+    "            print(f\"- '{item}' is not in our product list. (Skipped)\")\n",
+    "            continue\n",
+    "        if inventory[item] > 0:\n",
+    "            inventory[item] -= 1\n",
+    "            print(f\"- '{item}' deducted by 1. New stock: {inventory[item]}\")\n",
+    "        else:\n",
+    "            print(f\"- '{item}' is out of stock. (No change)\")\n",
+    "\n",
+    "\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    \"\"\"\n",
+    "    Calculate:\n",
+    "      - total unique products ordered\n",
+    "      - percentage of unique products ordered relative to total available products\n",
+    "    Returns a tuple: (total_unique_ordered, percent_unique)\n",
+    "    \"\"\"\n",
+    "    total_unique = len(customer_orders)\n",
+    "    total_products = len(products)\n",
+    "    percent_unique = (total_unique / total_products * 100) if total_products else 0.0\n",
+    "    return total_unique, percent_unique\n",
+    "\n",
+    "\n",
+    "def print_order_statistics(order_statistics):\n",
+    "    \"\"\"\n",
+    "    Nicely print the order statistics returned by calculate_order_statistics.\n",
+    "    \"\"\"\n",
+    "    total_unique, percent_unique = order_statistics\n",
+    "    print(\"\\n=== Order Statistics ===\")\n",
+    "    print(f\"- Total unique products ordered: {total_unique}\")\n",
+    "    print(f\"- % of unique catalog ordered: {percent_unique:.2f}%\")\n",
+    "\n",
+    "\n",
+    "def print_updated_inventory(inventory):\n",
+    "    \"\"\"\n",
+    "    Print the updated inventory in a simple, readable format.\n",
+    "    \"\"\"\n",
+    "    print(\"\\n=== Updated Inventory ===\")\n",
+    "    if not inventory:\n",
+    "        print(\"(No inventory data.)\")\n",
+    "        return\n",
+    "    for product, qty in inventory.items():\n",
+    "        print(f\"- {product}: {qty}\")\n",
+    "\n",
+    "\n",
+    "if __name__ == \"__main__\":\n",
+    "    # You can adjust this list anytime\n",
+    "    products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "    inventory = initialize_inventory(products)\n",
+    "    customer_orders = get_customer_orders()\n",
+    "    update_inventory(customer_orders, inventory)\n",
+    "\n",
+    "    stats = calculate_order_statistics(customer_orders, products)\n",
+    "    print_order_statistics(stats)\n",
+    "    print_updated_inventory(inventory)\n"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -61,7 +202,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.9.6"
   }
  },
  "nbformat": 4,