title: rbind all dataframes in a list of lists by name
body: <p>I'd like to rbind all <code>a</code> dataframes in <code>ALIST</code> - how would I do this? </p>
  
  <pre><code>alist &lt;- list(a = data.frame(1:3),
                b = data.frame(4:6),
                a = data.frame(7:9))
  
  (ALIST &lt;- list(alist, alist, alist))
  </code></pre>