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<script>
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window.onload = function () {
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document.createElement("frameset").setAttribute("onunload", "go()")
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}
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function go() {
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let a = document.getElementById("a");
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let b = document.getElementById("b");
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a.appendChild(b);
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}
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</script>
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<div id="a">
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<li id="b" contenteditable="true">
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