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<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
*{
text-align: center;
}
</style>
</head>
<body>
<script>
function fn(a) {
0 < a && fn(a - 1);
for (var b = 0; a; b++) {
b % 2 && (--a, document.write("*".repeat(b) + "<br>"));
}
}
fn(5)
</script>
</body>
</html>
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