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var dostuffEmitter = new EventEmitter();
dostuffEmitter.on('task1', function (callback) {
dostuffEmitter.emit('task2', x, callback);
});
dostuffEmitter.on('task2', function (x, callback) {
dostuffEmitter.emit('task3', y, callback);
});
dostuffEmitter.on('task3', function (y, callback) {
dostuffEmitter.emit('finish', z, callback);
});
dostuffEmitter.on('finish', function (z, callback) {
if (z < 0) {
callback(0);
} else {
callback(z);
}
});
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