title: Combining two .less files in one
body: <p>Suppose I have two less files, <code>first.less</code></p>
  
  <pre><code>.a {
    .b {
      font-size: 13px;
    }
    color: lime;
  }
  </code></pre>
  
  <p>and <code>second.less</code></p>
  
  <pre><code>@import "first.less";
  .a {
    font-family: sans-serif;
  }
  </code></pre>
  
  <p>I would like a way of combining them into one, merging the trees:</p>
  
  <pre><code>.a {
    .b {
      font-size: 13px;
    }
    color: lime;
    font-family: sans-serif;
  }
  </code></pre>
  
  <p>So, something similar as compiling to <code>.css</code>, but keeping the <code>.less</code> structure. Is it possible to do via a command line tool, library or programmatically?</p>