What is the most delicate and bony word in calligraphy paste?

I think Ou Yangxun's European style is quite exquisite. The inscription of Liquan in Jiucheng Palace is the pinnacle of regular script in Europe. (Of course, Liu Ti in Liu Gongquan is also very skinny. It depends on personal preference.

The main features of Ou Yangxun's calligraphy style are rigor, neatness, honest and frank and vigor. Although the glyph is a little longer, it is white, neat and rigorous, the middle palace is tight, the main pen is elongated, it looks bold and unrestrained, dense and well-organized, surrounded on all sides, exquisite and vivid, just right. The combination of stippling and painting, the structural arrangement, is that the middle of the plane is steep and powerful, and the fonts extend to the right, but the center of gravity is still very stable, without the feeling of inclination, which is interesting and dangerous.