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Redefine undefined outside the scope

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<p>First, undefined is defined to <em id="step1"></em></p>
<p>Then, undefined is redefined to <em id="step2"></em></p>
View fiddle.html
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$(document).ready(function() {
undefined = false;
/* We create a self-invoking function to refefine undefined to undefined */
(function() { window.undefined = undefined })();
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