diff --git a/pairem.ipynb b/pairem.ipynb
index 5e3e281..29ecaf4 100644
--- a/pairem.ipynb
+++ b/pairem.ipynb
@@ -33,7 +33,6 @@
    "execution_count": null,
    "metadata": {
     "autoscroll": false,
-    "collapsed": false,
     "ein.hycell": false,
     "ein.tags": "worksheet-0",
     "slideshow": {
@@ -43,17 +42,22 @@
    "outputs": [],
    "source": [
     "import csv\n",
+    "import random as rd\n",
+    "\n",
     "\n",
     "with open('class.csv', 'r') as f: \n",
-    "    students = [dict(l) for l in csv.DictReader(f)]"
+    "    students = [dict(l) for l in csv.DictReader(f)]\n",
+    "    for i in range(len(students)):\n",
+    "        students[i][\"index_student\"]=i  \n",
+    "      \n",
+    "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 131,
    "metadata": {
     "autoscroll": false,
-    "collapsed": false,
     "ein.hycell": false,
     "ein.tags": "worksheet-0",
     "slideshow": {
@@ -63,22 +67,48 @@
    "outputs": [],
    "source": [
     "def make_pairs(students):\n",
-    "    return []"
+    "    \n",
+    "    i = len(students)\n",
+    "    \n",
+    "    while (i>1):\n",
+    "    \n",
+    "        # exctract first name of the students\n",
+    "        student_pairs.append([students[i].get(\"First Name\"),students[i-1].get(\"First Name\")])\n",
+    "    \n",
+    "        i = i-1\n",
+    "    \n",
+    "    if (len(students)==1):\n",
+    "        print(\"Even number of students \" + students[0])\n",
+    "    \n",
+    "    return student_pairs\n",
+    "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 132,
    "metadata": {
     "autoscroll": false,
-    "collapsed": false,
     "ein.hycell": false,
     "ein.tags": "worksheet-0",
     "slideshow": {
      "slide_type": "-"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "IndexError",
+     "evalue": "list index out of range",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mIndexError\u001b[0m                                Traceback (most recent call last)",
+      "\u001b[0;32m<ipython-input-132-f49f784abb5e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      9\u001b[0m ]\n\u001b[1;32m     10\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 11\u001b[0;31m \u001b[0mpairs\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mmake_pairs\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtest_students\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     12\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     13\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;32m<ipython-input-131-e9b84300bffb>\u001b[0m in \u001b[0;36mmake_pairs\u001b[0;34m(students)\u001b[0m\n\u001b[1;32m      6\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      7\u001b[0m         \u001b[0;31m# exctract first name of the students\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 8\u001b[0;31m         \u001b[0mstudent_pairs\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mstudents\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mi\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"First Name\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mstudents\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mi\u001b[0m\u001b[0;34m+\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"First Name\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      9\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     10\u001b[0m         \u001b[0mi\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mi\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;31mIndexError\u001b[0m: list index out of range"
+     ]
+    }
+   ],
    "source": [
     "# Write your own test for the assignment!\n",
     "\n",
@@ -92,16 +122,37 @@
     "\n",
     "pairs = make_pairs(test_students)\n",
     "\n",
+    "\n",
     "# Write assertions here!\n",
     "assert(type(pairs) == list)"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
    "display_name": "Python 3",
+   "language": "python",
    "name": "python3"
   },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.6.3"
+  },
   "name": "Untitled.ipynb"
  },
  "nbformat": 4,