diff --git a/core/structs.ipynb b/core/structs.ipynb
index ed5c710..3c24bb4 100644
--- a/core/structs.ipynb
+++ b/core/structs.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:1b00dc5f93dc04f5ceb60a1b234ce2928c259b6ddbe2604d075cbf5f5d51a97f"
+  "signature": "sha256:81da7477f866f68f73a55003c5ea2e9a1ebc2c30bc7f6b884fa153c45265f794"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -1077,13 +1077,47 @@
       {
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 38,
+       "prompt_number": 51,
        "text": [
         "[1, 2, 5, 7, 8, 9, (1, 2), (4, 2)]"
        ]
       }
      ],
-     "prompt_number": 38
+     "prompt_number": 51
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## reversed"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Iterates over the sequence elements in reverse order"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "list(reversed(seq))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 53,
+       "text": [
+        "[(1, 2), (1, 2), (4, 2), 1, 5, 2, 9, 9, 7, 8, 1, 5, 2]"
+       ]
+      }
+     ],
+     "prompt_number": 53
     },
     {
      "cell_type": "markdown",
@@ -1176,7 +1210,7 @@
        ]
       }
      ],
-     "prompt_number": 43
+     "prompt_number": 50
     },
     {
      "cell_type": "markdown",