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a = "".__proto__
b = String().__proto__
for (var i = 0; i < 2; i++) {
a.__defineSetter__("valueOf", function() {})
a + ""
delete b.valueOf
}
a = "".__proto__
b = String().__proto__
for (var i = 0; i < 2; i++) {
a.__defineSetter__("valueOf", function() {})
a + ""
delete b.valueOf
}