minor edit

Author: Rise Riyo

part-4.ipynb

@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:2370e04209148fe9960fb427f1cf48a0972c89329bf5505554ad65ea1f41413d"
+  "signature": "sha256:826b0e4b3d39f844b868b8370fcaac110d06dbe6afb167b149a60d16aea5592e"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -554,6 +554,14 @@
      "language": "python",
      "metadata": {},
      "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
     }
    ],
    "metadata": {}