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<script>
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var haveCalledDone = false;
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window.addEventListener('beforeunload', function() {
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if (!haveCalledDone) {
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haveCalledDone = true;
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opener.done();
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}
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}, false);
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</script>
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<iframe sandbox="allow-scripts allow-top-navigation"
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src="close-top.html">
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</iframe>
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