/CSS/How to add space between menu items in css

How to add space between menu items in css

<head> 
    <meta charset="UTF-8"> 
    <title>Document</title> 
	<style> 
	ul {margin:0} 
	ul li {float:left;} 
	ul li a { 
		padding: 20px; 
		list-style:none; 
	} 
	</style> 
</head>

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