intro (น่าจะ)
5 -----------------------------------------------14--------------------------------14------------------------
4 ---12--14--------------------------------12---12--------------------------12---12--------------14--
3 ------------12---14--12--11---12--11---------12--11---11--12--11----------12--14--12-----
2 ---------------12-------------------------------------------------------------------------------------------
4 --------------------14-------------------14----------------------------
3 -----------------12---12-------------12---12--11--11--11--------