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result = "";
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(function() {
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CallMe = function(callback) {
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callback();
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};
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var say_hello_twice = function() {
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say_hello();
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CallMe(function(){
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say_hello();
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});
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};
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var say_hello = function() {
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result += 'hello world';
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};
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say_hello_twice();
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})();
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