title: Delete repeated data with Set in a nested list (Dart)
body: <p>I have problems removing repeated data from a nested list, I need to remove the records that are not repeated in the index 0 of the list, but the Set method is not doing anything when the list is nested.</p>
  <pre><code>for (int i = 0; i &lt; items.length; i++) {
        sections.add([items[i].sectionG, items[i].logo]);
      }
  
      sections = sections.toSet().toList();
  </code></pre>
  <p><a href="https://i.stack.imgur.com/SxUt1.png" rel="nofollow noreferrer">Imagen de la estructura de la lista</a></p>
  <p>When I go through Set I get back the same structure as before.</p>