diff --git a/dmedvedev/python/15.functions.ipynb b/dmedvedev/python/15.functions.ipynb
index 52ad64e..34e0210 100644
--- a/dmedvedev/python/15.functions.ipynb
+++ b/dmedvedev/python/15.functions.ipynb
@@ -156,7 +156,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 48,
+   "execution_count": null,
    "id": "d3c6683e",
    "metadata": {},
    "outputs": [
@@ -164,25 +164,19 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "<dm>_<orders>\n",
-      "<core>_<users>\n",
-      "<stg>_<payments>\n"
+      "dm_orders\n",
+      "core_users\n",
+      "stg_payments\n"
      ]
     }
    ],
    "source": [
     "def build_mart_name(entity_name, layer):\n",
-    "    return entity_name, layer\n",
+    "    print(f\"{layer}_{entity_name}\")\n",
     "\n",
-    "mart_name, lay = build_mart_name(\"orders\", \"dm\")\n",
-    "mart_name2, lay2 = build_mart_name(\"users\", \"core\")\n",
-    "mart_name3, lay3 = build_mart_name(\"payments\", \"stg\")\n",
-    "\n",
-    "\n",
-    "print(f\"<{lay}>_<{mart_name}>\")\n",
-    "print(f\"<{lay2}>_<{mart_name2}>\")\n",
-    "print(f\"<{lay3}>_<{mart_name3}>\")\n",
-    "\n"
+    "build_mart_name(\"orders\", \"dm\")\n",
+    "build_mart_name(\"users\", \"core\")\n",
+    "build_mart_name(\"payments\", \"stg\")"
    ]
   }
  ],