How to use the during function from async

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* will be passed an error, if one occurred, otherwise `null`.
* @example
*
* var count = 0;
*
* async.during(
*     function (callback) {
*         return callback(null, count < 5);
*     },
*     function (callback) {
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    test(check);
};

async.doDuring = function (iterator, test, callback) {
    var calls = 0;
    async.during(function(next) {
        if (calls++ < 1) {
            next(null, true);
        } else {
            test.apply(this, arguments);
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+ 21 other calls in file