Extent of my own powers meaning?

Output: 15 16 17 25 26 27 35 36 37 45 46 47

How should i study korean, and how many hours should i study it? i am a high school student already learn japanese in class, also i play sports so i tend to not study korean much because i have an excuse, like, ‘i dont know how to properly study for korean’ 감사합니다

How might someone identify "wash of cold river" as a lyric poem?