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<!doctype html>
<meta charset="utf-8">
<body>
<script>
window.onbeforeunload = () => ({ toString: () => { parent.currentEventInToString = window.event; } });
</script>
<!doctype html>
<meta charset="utf-8">
<body>
<script>
window.onbeforeunload = () => ({ toString: () => { parent.currentEventInToString = window.event; } });
</script>