10-11-13---11-10--------------
1-gt;---------------------------------------------------------------------------------------13--------
ต่อ
3-gt;-----------------------------------------------------------------------------------------
2-gt;--------------11--13-11--10-11-8-6----10--11--13--11--10----10---------------
1-gt;---11--10------------------------------------------------------------------------------
ต่อ
3-gt;--------------------------------------------------------------------------------------
2-gt;-----------------------10--8--10--6------11--11--8--6---11--13--11