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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#a {
height: 20px;
background-color: green;
}
#b {
background-color: green;
margin-top: 10px;
}
#c {
margin-top: 20px;
margin-bottom: 30px;
height: 0;
}
#d {
height: 10px;
background-color: red;
}
</style>
</head>
<body>
<div id="a"></div>
<div id="b">
<div id="c">
<div id="d"></div>
</div>
</div>
</body>
</html>
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