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<!DOCTYPE html>
<html>
<head>
<title>Challenge 22</title>
</head>
<body onload="challenge22()">
</body>
</html>
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function challenge22() {
var n = parseInt(prompt("Enter size of hollow triangle:"));
document.write("<pre>");
for (var i = 1; i < n; i++) {
for (var j = 0; j < n - i; j++)
document.write(" ");
document.write("#");
if (i > 1) {
for (var k = 0; k < 2 * i - 3; k++)
document.write(" ");
document.write("#");
}
document.write("\n");
}
for (var l = 1; l < n; l++)
document.write("# ");
document.write("#");
document.write("</pre>");
}
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