       <dd><pre class="code"><span class='lbrace'>{</span>
  <span class='label'>none:</span>     <span class='int'>0</span><span class='comma'>,</span>
  <span class='label'>alpha:</span>    <span class='int'>1</span><span class='comma'>,</span>
  <span class='label'>add:</span>      <span class='int'>2</span><span class='comma'>,</span>
  <span class='label'>mod:</span>      <span class='int'>3</span><span class='comma'>,</span>
  <span class='label'>multiply:</span> <span class='int'>4</span>
<span class