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(function (callback) { //func1
alert("1");
callback();
})(
(function (callback) { //func2
alert("2");
callback();
})(function () { //func3
alert("3");
})
);
(function (callback) { //func1
alert("1");
callback();
})(
(function (callback) { //func2
alert("2");
callback();
return function(){
alert(0)
}
})(function () { //func3
alert("3");
})
);