title: Combining two for loops into one
body: <p>I'm trying to find a better way to execute this method. </p>
  
  <pre><code>private void appendTiles(StringBuilder builder, String taggedRefData) {
      for (List&lt;Line&gt; column : columns) {
          for (Line line : column) {
              builder.append(line.link).append(line.text);
          }
      }
  }
  </code></pre>
  
  <p>Is there a more efficient way of doing this?</p>