td>
                </td>
            </tr>
            <tr>
                <td><code>if</code></td>
                <td>Conditional expression</td>
                <td>expression</td>
                <td>No</td>
                <td><code>yes</code></td>
                <td>
                </td>
            </tr>
            <tr>
                <td><code>initial</code></td>
                <td>Initial value</td>
                <td>expression</td>
                <td>No</td>
                <td><code>Non