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"content": "<p>Two strings <code>X</code> and <code>Y</code> are similar if we can swap two letters (in different positions) of <code>X</code>, so that it equals <code>Y</code>. Also two strings <code>X</code> and <code>Y</code> are similar if they are equal.</p>\n\n<p>For example, <code>"tars"</code> and <code>"rats"</code> are similar (swapping at positions <code>0</code> and <code>2</code>), and <code>"rats"</code> and <code>"arts"</code> are similar, but <code>"star"</code> is not similar to <code>"tars"</code>, <code>"rats"</code>, or <code>"arts"</code>.</p>\n\n<p>Together, these form two connected groups by similarity: <code>{"tars", "rats", "arts"}</code> and <code>{"star"}</code>. Notice that <code>"tars"</code> and <code>"arts"</code> are in the same group even though they are not similar. Formally, each group is such that a word is in the group if and only if it is similar to at least one other word in the group.</p>\n\n<p>We are given a list <code>strs</code> of strings where every string in <code>strs</code> is an anagram of every other string in <code>strs</code>. How many groups are there?</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = ["tars","rats","arts","star"]\n<strong>Output:</strong> 2\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = ["omv","ovm"]\n<strong>Output:</strong> 1\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= strs.length <= 300</code></li>\n\t<li><code>1 <= strs[i].length <= 300</code></li>\n\t<li><code>strs[i]</code> consists of lowercase letters only.</li>\n\t<li>All words in <code>strs</code> have the same length and are anagrams of each other.</li>\n</ul>\n",
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