The eight characters can only be arranged in four columns, and these four columns are used to tell fortunes, because these four columns represent the yin and yang and the five elements. The changing laws of Yin and Yang and the Five Elements are synchronized with the time changes of the year, month, day and hour. But the two time units are not synchronized with minutes and seconds. Therefore, the yin and yang and five elements used for fortune telling cannot be arranged into minute columns and second columns.