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<script>
onpageshow = function(e) {
var bc2 = new BroadcastChannel("testUrl2_bfcache");
bc2.onmessage = function(event) {
if (event.data == "back") {
bc2.close();
history.back();
}
};
bc2.postMessage({type: e.type, persisted: e.persisted});
};
</script>