Daan is happy for six consecutive years, but how to calculate the leap month when Chikou Xiaoji dies?

Hold out your left hand first, remember it must be your left hand. Count with your left thumb, and rotate clockwise in turn, starting from the root of your index finger, with the knuckles at the root of your index finger as Daan and the fingertips of your index finger as Linglian, then continue to pinch the fingertips of your middle finger as Susie, and continue to rotate clockwise, with the fingertips of your ring finger as red mouth, and then with the knuckles of your ring finger as Xiaoji. Then the last step is to go back to the middle finger root and die, and then pinch it again from the index finger root Daan, that is, from the index finger to the middle finger. This order is always fixed.