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<!DOCTYPE html>
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<iframe srcdoc="<iframe></iframe>"></iframe>
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<script>
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onload = function() {
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parent = frames[0];
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child = parent[0];
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child.onunload = function() {
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parent.document.open();
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}
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parent.document.open();
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parent.document.write("Hello");
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}
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</script>
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