diff --git a/Data/test.csv b/Data/test.csv
new file mode 100644
index 0000000..7c8d315
--- /dev/null
+++ b/Data/test.csv
@@ -0,0 +1,7 @@
+name,column1,column2,column3
+abc,1.1,4.2,1.2
+def,2.1,1.4,5.2
+ghi,1.5,1.2,2.1
+jkl,1.8,1.1,4.2
+mno,9.4,6.6,6.2
+pqr,1.4,8.3,8.4
diff --git a/Data/test_marked.csv b/Data/test_marked.csv
new file mode 100644
index 0000000..86dfd82
--- /dev/null
+++ b/Data/test_marked.csv
@@ -0,0 +1,7 @@
+name,column1,column2,column3
+abc,1.1^,4.2,1.2^
+def,2.1,1.4,5.2
+ghi,1.5,1.2,2.1
+jkl,1.8,1.1^,4.2
+mno,9.4*,6.6,6.2
+pqr,1.4,8.3*,8.4*
diff --git a/tutorials/sorting_csvs.ipynb b/tutorials/sorting_csvs.ipynb
index 9aaf2f2..04e99ab 100644
--- a/tutorials/sorting_csvs.ipynb
+++ b/tutorials/sorting_csvs.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:c498612c4d414160d8e015bc6858051328e51cd00e56b3215dca53652ee7c936"
+  "signature": "sha256:683cfd7e6b5fd1dca9cd2028b294ec8ae44a175b613eb3c037d365a28957a987"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -133,12 +133,9 @@
       "    in the sublist represents 1 cell in the table.\n",
       "    \n",
       "    \"\"\"\n",
-      "    csv_content = []\n",
       "    with open(csv_file, 'r') as csv_con:\n",
       "        reader = csv.reader(csv_con, delimiter=delimiter)\n",
-      "        for row in reader:\n",
-      "            csv_content.append(row)\n",
-      "    return csv_content"
+      "        return list(reader)"
      ],
      "language": "python",
      "metadata": {},
@@ -169,7 +166,7 @@
        ]
       }
      ],
-     "prompt_number": 4
+     "prompt_number": 3
     },
     {
      "cell_type": "markdown",
@@ -215,7 +212,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 2
+     "prompt_number": 4
     },
     {
      "cell_type": "code",
@@ -248,7 +245,7 @@
        ]
       }
      ],
-     "prompt_number": 3
+     "prompt_number": 5
     },
     {
      "cell_type": "markdown",