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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<style type="text/css" media="screen">
body { background-color: #000; font: 16px Helvetica, Arial; color: #fff; }
</style>
</head>
<body>
<ul class="let-2">
  <a>A</a>
  <li style="display: none;">test1</li>
  <li style="display: none;">test2</li>
  <li style="display: none;">test3<ul><li>www</li></li></ul>
</ul>
  
  <ul class="let-1">
  <a>B</a>
  <li>test1</li>
    <li style="display: none;">test2</li>
  <li style="display: none;">test3</li>
</ul>
  <ul class="let-3">
  <a>C</a>
  <li>test1</li>
    <li>test2</li>
  <li style="display: none;">test3</li>
</ul>
  
<script type="text/javascript">
var filterOptions = function() {
  
  
  $('[class^="let"]').show().filter(function() {
  return $(this).find('li:visible').length ==  0;
  }).hide();
 
} 
$(document).ready(function() {
  filterOptions();
});
</script>
</body>
</html>
Output

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