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<!DOCTYPE html>
<html>
<head>
<style>
ul#menu li {
    display:inline;
}
</style>
</head>
<body>

<h2>Horizontal List</h2>

<ul id="menu">
  <li>HTML</li>
  <li>CSS</li>
  <li>JavaScript</li>
  <li>PHP</li>
</ul>  

</body>
</html>