diff --git a/ipynb/Portmantout.ipynb b/ipynb/Portmantout.ipynb
index 831a11c..b31b766 100644
--- a/ipynb/Portmantout.ipynb
+++ b/ipynb/Portmantout.ipynb
@@ -919,7 +919,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Yes, there is a problem: there are many more words that start with `b`, `f`, `p`, `u`, `u` and `v` than that end with those letters. In the other direction 45% of all words end in `s`, but only a quarter of that number start with `s`. The start:end ratio for `y` is 1:39."
+    "Yes, there is a problem: there are many more words that start with `b`, `f`, `p`, `u`, and `v` than that end with those letters. In the other direction 45% of all words end in `s`, but only a quarter of that number start with `s`. The start:end ratio for `y` is 1:39."
    ]
   },
   {