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@@ -1231,7 +1231,7 @@ class MySequence:
 ### Collections.abc.Sequence
 * **It's a richer interface than the basic sequence.**
 * **Extending it generates iter(), contains(), reversed(), index(), and count().**
-* **Unlike `'abc.Iterable'` and `'abc.Collection'`, it is not a duck type. That's why `'issubclass(MySequence, collections.abc.Sequence)'` would return 'False' even if it had all the methods defined.**
+* **Unlike `'abc.Iterable'` and `'abc.Collection'`, it is not a duck type. That is why `'issubclass(MySequence, collections.abc.Sequence)'` would return 'False' even if it had all the methods defined.**
 ```python
 class MyAbcSequence(collections.abc.Sequence):
     def __init__(self, a):
diff --git a/index.html b/index.html
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@@ -1144,7 +1144,7 @@ con  = sqlite3.connect(<span class="hljs-string">'&lt;path&gt;'</span>); <span c
 <ul>
 <li><strong>It's a richer interface than the basic sequence.</strong></li>
 <li><strong>Extending it generates iter(), contains(), reversed(), index(), and count().</strong></li>
-<li><strong>Unlike <code class="python hljs"><span class="hljs-string">'abc.Iterable'</span></code> and <code class="python hljs"><span class="hljs-string">'abc.Collection'</span></code>, it is not a duck type. That's why <code class="python hljs"><span class="hljs-string">'issubclass(MySequence, collections.abc.Sequence)'</span></code> would return 'False' even if it had all the methods defined.</strong></li>
+<li><strong>Unlike <code class="python hljs"><span class="hljs-string">'abc.Iterable'</span></code> and <code class="python hljs"><span class="hljs-string">'abc.Collection'</span></code>, it is not a duck type. That is why <code class="python hljs"><span class="hljs-string">'issubclass(MySequence, collections.abc.Sequence)'</span></code> would return 'False' even if it had all the methods defined.</strong></li>
 </ul>
 <pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyAbcSequence</span><span class="hljs-params">(collections.abc.Sequence)</span>:</span>
     <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, a)</span>:</span>