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<!--
Any copyright is dedicated to the Public Domain.
-->
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
</head>
<body>
<iframe></iframe>
<script>
window.onmessage = e => {
opener.postMessage(e.data, "*");
}
</script>
</body>
</html>