1. The crow feeds back:
Sourced from the second chapter of "Xue Bao Recognizes His Mother" by Anonymous Yuan Dynasty: As the saying goes, horses have drooping reins, dogs have grass spread out, and they tread in the middle of the street. Ciwu feeds back.
2. Holding a ring and knotting grass:
The poem "Redemption of Chicken" by Bai Juyi of the Tang Dynasty: Don't learn to hold a bird in a ring to repay kindness.