When the lunar calendar meets a leap month, how are the earthly branches of this leap month arranged?

Fortune-telling months are arranged according to seasons. After beginning of spring, it is the first month, after the fright, it is February, after the Qingming Festival, it is March, after Xia Hou, it is April, behind the scenes, it is May, after the slight summer heat, it is June, after beginning of autumn, it is July, after the Millennium, it is August, after the cold dew, it is September, after beginning of winter, it is October, after the heavy snow, it is November, and after the slight cold, it is December.