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function mp(g) {
var ans = '';
for (var i = 0; i < 5; ++i) {
ans += g();
}
return ans;
}
function f() {
var k = 5;
function g() {
return k;
}
ans = '';
k = 6;
ans += mp(g);
delete k;
ans += mp(g);
return ans;
}
assertEq(f(), '6666666666');