Swallow-headed swallows and swallows don't fly together'. What's behind it?

① Swallowtail of silkworm head, full of twists and turns; Swallows do not fly in pairs, and silkworms do not oppose each other; (3) Heavy turbidity is light and clear, and it is as stable as Mount Tai. This means that horizontal and vertical strokes don't have to be straight, and there can be ups and downs. Writing is divided into three stages (pause, frustration, and pen-lifting), namely, starting the pen, folding the right hand, and closing the pen; Write the silkworm-headed phoenix tail (also called goose tail) on the main horizontal line or main hook, and each word has only one silkworm-headed phoenix tail (but not necessarily every word has a silkworm-headed phoenix tail); The strokes can be thick or thin, with the thick part more turbid and the thin part lighter and clearer. When you write short, you should stop writing quickly, but you can't stop writing. You should make the end of the painting as hard and powerful as chopping nails and cutting iron blocks, and you can't repaint it.