minor grammatical change

Author: Rise Riyo

part-4.ipynb

@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:cdcea0fa307ec1a5a8d16fcca9cd7755211f74a5615af2d00b45071b0ef5f37c"
+  "signature": "sha256:cc99296d9dd44c36671918c973d625cd8d0fe7b970a61ec7421d066817a07826"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -41,7 +41,8 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": []
+     "outputs": [],
+     "prompt_number": 3
     },
     {
      "cell_type": "markdown",
@@ -60,7 +61,8 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": []
+     "outputs": [],
+     "prompt_number": 4
     },
     {
      "cell_type": "code",
@@ -70,7 +72,17 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": []
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 5,
+       "text": [
+        "[1, 1, 4, 9, 25, 64, 169, 441, 1156, 3025, 7921]"
+       ]
+      }
+     ],
+     "prompt_number": 5
     },
     {
      "cell_type": "markdown",
@@ -83,7 +95,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Now let's do the same thing with a list comprehension:"
+      "Now let's do the same thing by using a list comprehension instead:"
      ]
     },
     {