How to remove plurals in a list of nouns?
<p>I have a list of strings:</p>

<pre><code>['bill', 'simpsons', 'cosbys', 'cosby','bills','mango', 'mangoes']
</code></pre>

<p>What is the best to remove all the plurals from this list?
So, I want the output to be:</p>

<pre><code>['bill', 'simpsons', 'cosby','mango']
</code></pre>
