Tables with rowspan and colspan, hard for parsers

<table border="1">
    <tr>
        <td>11</td>
        <td rowspan="2"> DMAT Aud. 6 </td>
        <td rowspan="4"> Exam</td>
        <td rowspan="2"> DMAT Aud. 7</td>
        <td>11</td>
    </tr>
    <tr>
        <td>22</td>
        <td rowspan="2"> CART Aud. 4 A</td>
    </tr>
    <tr>
        <td>33</td>
        <td rowspan="2"> CART Aud. 4 B</td>
        <td rowspan="2"> OOP Aud. 7</td>
    </tr>
    <tr>
        <td>44</td>
        <td>44</td>
    </tr>
</table>

<table border="1">
    <tr>
        <td>1 </td>
        <td>1 </td>
        <td>1 </td>
        <td rowspan="4">Thing</td>
        <td>1 </td>
    </tr>
    <tr>
        <td>2 </td>
        <td>2 </td>
        <td>2 </td>
        <td>2 </td>
    </tr>
    <tr>
        <td>3 </td>
        <td>3 </td>
        <td>3 </td>
        <td>3 </td>
    </tr>
    <tr>
        <td>4 </td>
        <td>4 </td>
        <td>4 </td>
        <td>4 </td>
    </tr>
</table>

<table border="1">
<tr>
    <td colspan="2" rowspan="4">#1</td>
    <td rowspan="4">#2</td>
    <td rowspan="2">#3</td>
    <td rowspan="2">#4</td>
</tr>
<tr></tr>
<tr>
    <td rowspan="2">#5</td>
    <td rowspan="2">#6</td>
</tr>
<tr></tr>
</table>