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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#block1, #block2 {
height: 20px;
background-color: orange;
}
#multi-column {
height: 20px;
background-color: blue;
}
.spacer {
height: 20px;
}
</style>
</head>
<body>
<div id="block1"></div>
<div class="spacer"></div>
<div id="multi-column"></div>
<div class="spacer"></div>
<div id="block2"></div>
</body>
</html>