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Redefine undefined outside the scope
<p>First, undefined is defined to <em id="step1"></em></p>
<p>Then, undefined is redefined to <em id="step2"></em></p>
$(document).ready(function() {
undefined = false;
$("#step1").text();
/* We create a self-invoking function to refefine undefined to undefined */
(function() { window.undefined = undefined })();
$("#step2").text(undefined);
});
normalize_css: no
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