in reading order</td>
    <td>1.2.4</td>
  </tr>
  <tr>
    <td align="center"> [ &lt;&lt; ] </td>
    <td align="center">FastBack</td>
    <td>beginning of this chapter or previous chapter</td>
    <td>1</td>
  </tr>
  <tr>
    <td align="center"> [ Up ] </td>
    <td align="center">Up</td>
    <td>up section</td>
    <td>1.2</td>
  </tr>
  <tr>
    <td align="center"> [ &gt;&gt; ] </td>
    <td align="center">FastForward</td>
    <td>next chapter</td>
    <td>2</td>
  </tr>
  <tr>
    <td align="center"> 