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<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
    margin: 2cm 4cm 3cm 4cm;
}

</style>
</head>
<body>

<p>A paragraph with no specified margins.</p>
<p class="ex1">A paragraph with specified margins.</p>
<p>A paragraph with no specified margins.</p>

</body>
</html>