1, how many years does the main branch cycle, is actually to find the least common multiple of 10 and 12. The least common multiple of 10 and 12 is 60, so the calendar year of trunks and branches is once every 60 years. So 60 years is called Jiazi on the chronology of cadres and branches.
2,2049-2022 = 27,27 ÷10 = 2 ... 7, that is, the latter 7, give it to yourself; 27 ÷ 12 = 2 ...3, that is, three from the back, that is, the fourth. So I'm four years old in 2049. Similarly, 1982 can be regarded as the year of Ren Xu.
3. According to the chronological rules of cadres and branches, odd numbers match odd numbers, even numbers of spouses, the second is even numbers, and the application is odd numbers, so it is impossible to have a second Shen Nian. A and Zi are singular, so there is a year of Jia. In the same way, it is impossible to have Geng Hainian and Ren Weinian.