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<p>A <strong>pangram</strong> is a sentence where every letter of the English alphabet appears at least once.</p>
<p>Given a string <code>sentence</code> containing only lowercase English letters, return<em> </em><code>true</code><em> if </em><code>sentence</code><em> is a <strong>pangram</strong>, or </em><code>false</code><em> otherwise.</em></p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> sentence = &quot;thequickbrownfoxjumpsoverthelazydog&quot;
<strong>Output:</strong> true
<strong>Explanation:</strong> sentence contains at least one of every letter of the English alphabet.
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> sentence = &quot;leetcode&quot;
<strong>Output:</strong> false
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= sentence.length &lt;= 1000</code></li>
<li><code>sentence</code> consists of lowercase English letters.</li>
</ul>