ûҳ ü - ⵿Ѵ,ҹ 1~3 youtube ּ:
https://www.youtube.com/watch?v=PrrPc08pv1M
https://www.youtube.com/watch?v=goxn9Xu7glY
https://www.youtube.com/watch?v=P-rA-f6gzQc