Shen Collection, Upper Volume Radical: Grass (cǎo) Entry: Bu Kangxi Strokes: 17 Page 1053, Entry 07 Pronounced bu (falling tone). Book of Changes (Yijing), Hexagram Feng: Obscuring it with a screen. Commentary: A screen is something that covers, conceals, or blocks light. Also pronounced pou (falling tone). A small mat. Also pronounced bu (falling tone). A type of grass. Erya (Boya): A screen is a water-pepper plant. According to the Book of Odes (Shijing), Greater Odes, opening of the King Wen Shoumeng commentary: In the Three Systems calendar, seventy-two years constitute one cycle (bu), and twenty cycles constitute one era (ji). Book of Han (Hanshu), Treatise on Harmonics and Calendrical Astronomy: Taking the remainder of one intercalary month as the beginning of a cycle. According to Ancient Pronunciations of the Tang Rhymes: In the Book of Changes, obscuring it with a screen, Lu Deming, Explanation of Texts (Shiwen): Pronounced bu.