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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
</head>
<body>
<script>
"use strict";
window.big = (function makeBig(depth = 0) {
let big = Array(5);
big.fill(undefined);
if (depth < 5) {
big = big.map(_ => makeBig(depth + 1));
}
return big;
}());
</script>
</body>
</html>