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<!DOCTYPE html>
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<html>
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<body>
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<script>
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var o1 = document.documentElement;
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var o2 = document.createElement("frame");
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document.documentElement.appendChild(o2);
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var o3 = o2.contentWindow;
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o1.parentNode.removeChild(o1);
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o3.customElements;
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</script>
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</body>
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</html>
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