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<!DOCTYPE html>
<meta charset="utf-8">
<script>
addEventListener('message', evt => {
evt.source.postMessage(evt.data, '*', [evt.data]);
});
</script>
<!DOCTYPE html>
<meta charset="utf-8">
<script>
addEventListener('message', evt => {
evt.source.postMessage(evt.data, '*', [evt.data]);
});
</script>