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--------
2  ---12--13--12---------12--13--12-------------------13-----------
1  -------------------------------------------------------------------15----