The "A-C-E-G-Ren" in Ten Days Gan is named after twelve corresponding "Zi Chen Yin Wu Shen Shu" such as Jia Zi and Jia Yin. . . Bingzi, bingyin. . .
Decameron's "Yi Ding Ji Xin Ghost" is combined with the corresponding "ugly and sea" in Twelve Branches, such as ugly Mao and Mao Yi. . .
These sixty idioms can be used in four aspects: year, month, day and time.
In birthdates, a geomantic fortune teller, it is often used to choose dates or look at people, which means auspicious days.