js table with same code example

Example: if both td data are same then merze how in javascript

<table>
  <tr>hi</tr>
  <tr>
    <td>fish</td>
    <td>salmon</td>
  </tr>
  <tr>
    <td>fish</td>
    <td>cod</td>
  </tr>
  <tr>
    <td>fish</td>
    <td>plaice</td>
  </tr>
  <tr>
    <td>bird</td>
    <td>robin</td>
  </tr>
  <tr>
    <td>bird</td>
    <td>crow</td>
  </tr>
</table>

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Javascript Example

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