diff --git a/L0 - Introduction to MapReduce data processing model/MapReduceExamples.ipynb b/L0 - Introduction to MapReduce data processing model/MapReduceExamples.ipynb
index d29436e..574cf82 100644
--- a/L0 - Introduction to MapReduce data processing model/MapReduceExamples.ipynb	
+++ b/L0 - Introduction to MapReduce data processing model/MapReduceExamples.ipynb	
@@ -1,5 +1,15 @@
 {
-
+  "nbformat": 4,
+  "nbformat_minor": 0,
+  "metadata": {
+    "colab": {
+      "provenance": []
+    },
+    "kernelspec": {
+      "name": "python3",
+      "display_name": "Python 3"
+    }
+  },
   "cells": [
     {
       "cell_type": "markdown",
@@ -470,7 +480,7 @@
         "import numpy as np\n",
         "\n",
         "mat = np.ones((5,4))\n",
-        "vec = np.random.rand(5) # in-memory vector in all map tasks\n",
+        "vec = np.random.rand(4) # in-memory vector in all map tasks\n",
         "\n",
         "def MAP(coordinates:(int, int), value:int):\n",
         "  i, j = coordinates\n",
@@ -928,9 +938,7 @@
       "metadata": {
         "id": "MQhoJaVZI93G"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -963,9 +971,7 @@
       "metadata": {
         "id": "3GRA1JR-Tkbg"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -987,9 +993,7 @@
       "metadata": {
         "id": "MPoY5pkfUNZf"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1009,9 +1013,7 @@
       "metadata": {
         "id": "hQPn3USsIkEC"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1031,9 +1033,7 @@
       "metadata": {
         "id": "okjbyApjGhMt"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1057,9 +1057,7 @@
       "metadata": {
         "id": "4nKIKe59uIfc"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1083,9 +1081,7 @@
       "metadata": {
         "id": "BEvuY4GqvhS6"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1107,9 +1103,7 @@
       "metadata": {
         "id": "Sns7a5agv3nw"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1131,9 +1125,7 @@
       "metadata": {
         "id": "XKlBZh4IwERR"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1155,9 +1147,7 @@
       "metadata": {
         "id": "QE_AC09lwZIZ"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
     },
@@ -1179,9 +1169,7 @@
       "metadata": {
         "id": "yHiuuTctw86I"
       },
-      "source": [
-        ""
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+      "source": [],
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       "outputs": []
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@@ -1203,9 +1191,7 @@
       "metadata": {
         "id": "MLPckfEGxico"
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-      "source": [
-        ""
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+      "source": [],
       "execution_count": null,
       "outputs": []
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@@ -1234,9 +1220,7 @@
       "metadata": {
         "id": "KQhDbiL3zS9r"
       },
-      "source": [
-        ""
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+      "source": [],
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       "outputs": []
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@@ -1418,9 +1402,7 @@
       "metadata": {
         "id": "3B7rIAJCaHZq"
       },
-      "source": [
-        ""
-      ],
+      "source": [],
       "execution_count": null,
       "outputs": []
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@@ -1438,9 +1420,7 @@
       "metadata": {
         "id": "TDM_s78Rb5eR"
       },
-      "source": [
-        ""
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+      "source": [],
       "execution_count": null,
       "outputs": []
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@@ -1458,9 +1438,7 @@
       "metadata": {
         "id": "ehN0FqRDcwU5"
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-      "source": [
-        ""
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+      "source": [],
       "execution_count": null,
       "outputs": []
     }