the three digits are drawn from the sounds within the surname using the following algorithm:</p>

<ol>
  <li>Extract only the letters from the surname, discarding all non-letters (no dashes, spaces, apostrophes, ‚Ä¶).</li>
  <li>
    <p>Encode each letter as a digit using the table below.</p>

    <table class="table-condensed table-striped table-bordered">
      <tbody>
        <tr>
          <td><strong>Digit</strong></td>
          <td>represents the letters</td>
        </tr>
        <tr>
          