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Test Info:

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
var a = new FileReader();
function f() {
a.removeEventListener("loadend", f);
g();
}
function g() {
a.readAsBinaryString(new Blob());
}
a.addEventListener("loadend", f);
try {
g();
g();
} catch(e) {}
</script>
</body>
</html>