export default (function (o, c) {
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								  var proto = c.prototype;
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								  proto.isoWeeksInYear = function () {
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								    var isLeapYear = this.isLeapYear();
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								    var last = this.endOf('y');
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								    var day = last.day();
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								    if (day === 4 || isLeapYear && day === 5) {
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								      return 53;
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								    }
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								    return 52;
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								  };
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								});
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