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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script>
opener.postMessage("hello", "*");
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script>
opener.postMessage("hello", "*");
</script>
</head>
<body>
</body>
</html>