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<!DOCTYPE html>
<html>
<head>
<style>
h1 {font-size: 50px;}
h2 {font-size: 30px;}
p {
    font-size: 15px;
    line-height: 20px;
}
</style>
</head>
<body>

<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>

</body>

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</html>