e>.</li>
<li><code class="code">x</code>: convert an integer argument to unsigned hexadecimal,
     using lowercase letters.</li>
<li><code class="code"><span class="constructor">X</span></code>: convert an integer argument to unsigned hexadecimal,
     using uppercase letters.</li>
<li><code class="code">o</code>: convert an integer argument to unsigned octal.</li>
<li><code class="code">s</code>: insert a string argument.</li>
<li><code class="code"><span class="constructor">S</span></code>: convert a str