title: Eliminate element of every list within a nested list
body: <p>I would like to eliminate the third element of every list within a nested list.</p>
  
  <p>E.g., </p>
  
  <pre><code>    lst = { {1, 0, 0}, {1, 1, 1}, {1, 1, 4} }
  </code></pre>
  
  <p>So it would become</p>
  
  <pre><code>    { {1, 0}, {1, 1}, {1, 1} }
  </code></pre>
  
  <p>How should I do that?</p>