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<script>
const iframe_1_script = encodeURI(`
<script>
try {
document.domain = document.domain;
parent.postMessage("not sandboxed", "*");
} catch (exception) {
parent.postMessage("sandboxed", "*");
}
</scr`+`ipt>
`);
const iframe_1 = parent.document.querySelector("#iframe_1");
iframe_1.src = `data:text/html,${iframe_1_script}`;
</script>