What does transparency mean when doing annual work (monthly work)?

The eight-character heavenly stems are called Tianyuan, the earthly branches are called Yuan Di, and the heavenly stems contained in the earthly branches are called Renyuan.

The human element (heavenly stem) contained in the earthly branches is also found in the eight-character annual stem (monthly stem), which is called the annual stem (monthly stem).

For example, the monthly dryness includes heavenly dryness A, C and E. If the annual dryness (monthly dryness) also includes A, C and E, then the A, C and E on the annual dryness (monthly dryness) are called Tou.