xt.</td>
    </tr>
   <tr id="#20">
      <td style="text-align:right;">20</td>
      <td style="text-align:center;">&#128522;</td>
      <td style="text-align:left;">$$
1+1=2
$$</td>
      <td style="text-align:left;"><section><eqn><span class="katex-display"><span class="katex"><span class="katex-mathml"><math><semantics><mrow><mn>1</mn><mo>+</mo><mn>1</mn><mo>=</mo><mn>2</mn></mrow><annotation encoding="application/x-tex">
1+1=2
</annotation></semantics></math></span><span class="katex-html" aria-hidden=