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<!doctype html>
<script>
"use strict";
let target = window.opener ? window.opener : window.parent;
onmessage = () => target.postMessage({}, "*");
</script>
<!doctype html>
<script>
"use strict";
let target = window.opener ? window.opener : window.parent;
onmessage = () => target.postMessage({}, "*");
</script>