What you are talking about is 3 5 6 at the beginning of the score. First of all, the handle position of the 37 strings (note that there are dots below) does not start from a handle, but from the cut handle position, that is, the empty strings of the inner and outer strings and your finger form a third degree, not the traditional second degree. The first three sounds are all outer strings, not inner strings as you think. Find the handle position, and the finger pressed by the outer string is the re sound, so the first sound mi is the second finger of the outer string, and then you need to change the handle and press 5 with one finger, and the second finger is 6. These three sounds involve changing the handle.