span class=special>{ </span><span class=identifier>
            l</span><span class=special>.</span><span class=identifier>concat</span><span class=special>(</span><span class=identifier>r</span><span class=special>); 
        </span><span class=special>}
    </span><span class=special>};</span></code></pre>
<table width="90%" border="0" align="center">
  <tr> 
    <td class="table_title" colspan="12"> Recognition and matching </td>
  </tr>
  <tr> 
  <tr> 
    <td class="table_cells"><b>result</b></td>
    