diff --git a/book/python/04_string_operations.ipynb b/book/python/04_string_operations.ipynb
index b6c6296..0943419 100644
--- a/book/python/04_string_operations.ipynb
+++ b/book/python/04_string_operations.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "bcb4d025",
+   "id": "0",
    "metadata": {},
    "source": [
     "# String Operations\n",
@@ -12,7 +12,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b8d33eeb",
+   "id": "1",
    "metadata": {},
    "source": [
     "## Creating and Manipulating Strings\n",
@@ -23,7 +23,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "0ef1fb56",
+   "id": "2",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -32,7 +32,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f5e965b3",
+   "id": "3",
    "metadata": {},
    "source": [
     "You can concatenate (join) strings using the `+` operator:"
@@ -41,7 +41,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "42526b7a",
+   "id": "4",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -51,7 +51,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "eae07d43",
+   "id": "5",
    "metadata": {},
    "source": [
     "You can also repeat strings using the `*` operator:"
@@ -60,7 +60,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "508b11d4",
+   "id": "6",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -70,7 +70,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5669c026",
+   "id": "7",
    "metadata": {},
    "source": [
     "## String Methods for Geospatial Data\n",
@@ -85,7 +85,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "caefbc57",
+   "id": "8",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -96,7 +96,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "14c657bd",
+   "id": "9",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -107,7 +107,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "640f1423",
+   "id": "10",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -118,7 +118,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "827dd307",
+   "id": "11",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -128,7 +128,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b24b43e0",
+   "id": "12",
    "metadata": {},
    "source": [
     "## Formatting Strings\n",
@@ -139,7 +139,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "248322a2",
+   "id": "13",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -152,7 +152,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "616a001f",
+   "id": "14",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -162,7 +162,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "58262850",
+   "id": "15",
    "metadata": {},
    "source": [
     "## Parsing and Extracting Information from Strings\n",
@@ -173,7 +173,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "bc54dbed",
+   "id": "16",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -186,7 +186,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6f54635f",
+   "id": "17",
    "metadata": {},
    "source": [
     "## Exercises\n",
@@ -199,10 +199,10 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f910f3f0",
+   "id": "18",
    "metadata": {},
    "source": [
-    "### Conclusion\n",
+    "## Conclusion\n",
     "\n",
     "String operations are crucial in geospatial programming, especially when dealing with textual geographic data. Mastering these operations will enable you to handle and manipulate geographic information effectively in your projects."
    ]
diff --git a/book/python/04_string_operations.md b/book/python/04_string_operations.md
index 07c4242..064b106 100644
--- a/book/python/04_string_operations.md
+++ b/book/python/04_string_operations.md
@@ -5,10 +5,6 @@ jupytext:
     format_name: myst
     format_version: 0.13
     jupytext_version: 1.16.2
-kernelspec:
-  display_name: geo
-  language: python
-  name: python3
 ---
 
 # String Operations
@@ -42,7 +38,6 @@ print(separator)
 ## String Methods for Geospatial Data
 
 Python provides various built-in methods to manipulate strings. Some commonly used methods include:
-
 - `lower()`, `upper()`: Convert strings to lowercase or uppercase.
 - `strip()`: Remove leading and trailing whitespace.
 - `replace()`: Replace a substring with another substring.
@@ -105,6 +100,6 @@ print(f"Parsed coordinates: ({latitude}, {longitude})")
 
 +++
 
-### Conclusion
+## Conclusion
 
 String operations are crucial in geospatial programming, especially when dealing with textual geographic data. Mastering these operations will enable you to handle and manipulate geographic information effectively in your projects.