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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
</head>
<body>
<script type="text/javascript">
window.addEventListener("load", () => {
window.parent.postMessage("loaded", "*");
});
</script>
</body>
</html>