our string similarity function we select pairs that differ one letter from each other, so we end up with the following set of pairs as an example</p>
<pre><code>rotterdam -&gt; rottrdam
rotterdam -&gt; rotterdm
rotterdm -&gt; rottrdm
rtterdam -&gt; rotterdam
amsterdam -&gt; amstrdam
amstrdam -&gt; amstdam
amsterdm -&gt; amsterdam</code></pre>
<p>That means that we are saying that <code>rotterdam</code> is the same object as <code>rottrdam</code> which is the same object as <code>rottrdm</code>. Therefore, <