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从练习＃12 他们返回两只手. 正如你可以看到, 演习 #12 和 #13 是 镜子, in which right hand and left hand reverse their roles. All in all, this exercise provides for the execution of the five notes scale, 从C至G, ascending and descending, firstly with the right hand (ex. #12) and then with the left one (ex. #13).

I wouldn’t expatiate too much about it, because I think from this moment on (unless particular or innovatory cases explanations) only good practice is useful.