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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
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<body>
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function numbering() {
i = 0;
while (i< 20) {
document.write(i);
i += 1;
}
}
numbering();
</script>
</body>
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