Fixed typo in "example"

ipynb/Sicherman Dice.ipynb

@@ -1100,7 +1100,7 @@
    "source": [
     "Now, what do we have to do for `all_dice(N)`?  When we knew we had six sides, we wrote six nested loops. We can't do that for *N*, so what do we do?\n",
     "\n",
-    "**Here's an iterative approach: we keep track of a list of partially-formed dice, and on each iteration, we add a side to all the partially-formed dice in all possible ways, until the dice all have `N` sides. So for eaxmple, we'd start with:**\n",
+    "**Here's an iterative approach: we keep track of a list of partially-formed dice, and on each iteration, we add a side to all the partially-formed dice in all possible ways, until the dice all have `N` sides. So for example, we'd start with:**\n",
     "\n",
     "    dice = [(1,)]\n",
     "    \n",