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<!DOCTYPE html>
<html>
<head>
<style>
h1 {
  letter-spacing: 3px;
}
h2 {
  letter-spacing: 2px;
}
h3 {
  letter-spacing: -1px;
}
</style>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
</body>
</html>