What does the "ugly year" in the yellow calendar mean? Oh, I don't quite understand. Please help scholars.

Ten-day cadres: A (ji ǐ), B (yǐ), C (bǐng), D (D ǜ ng), E (w ǐ), G (G ǜ ng) and Xin (X ǜ n). Twelve earthly branches: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei and Shen. Ugly: cattle; Yin: Tiger; Thumb: rabbit; Chen: Dragon; Rudder: snake; Afternoon: horse; No: sheep; Shen: Monkey; Hey: chicken; Hey: dog; H: pigs. )。 Ten branches and twelve branches are matched in turn to form sixty basic units. The ancients used this as the serial number of the year, month, day and time, which was called "the year of the dry branch"

1 .jiazi 2. Ugly B 3 Bing yinsi. Ding Mao 5. Chen Wu 6. Keith seven. Wu Geng 8. Wei Xin 9. Ren Shen 10. Gui You

1 1. JOE 12. Yihai 13. Bing Zi 14. Ding Chou 15. Wuyin 16. Bazaar 17. Chen Geng 65438.

2 1. Shen Jia 22. Yiyou 23. Xu Bing 24. Ding hai 25. Woods 26. Ji Chou 27. Geng yin is twenty-eight Xinmao 29. Chen Young 30. Guisi

3 1. Wu Jia 32. Yiwei 33. Shen Bing 34. Dingyou 35. The reform movement of 1898. Jihai 37. Gengzi 38. Xin Chou 39. Ren Yin 40. Guimao.

4 1 .Chen Jia 42. Yisi 43. It's forty-four in the afternoon. Ding Wei 45. Wu Shen 46. Ji You 47. Geng Xu 48. Xinhai 49. Renzi is fifty. Ugly.

5 1 .52 good news. Mao yi 53. Chen Bing 54. Ding si 55 Wu Wu 56. Wiki 57. Geng Shen 58. Heart has 59. Ren Xu 60. Guihai