1------------------12------12-------------------- 
2------10-10--------10-------10----------10-- 
3--12-----------------------------------12-------- 
1------------------12------12-------------------- 
2------10-10--------10-------10----------10-- 
3--12-----------------------------------12-------- 
1---------------------15--------------15--------- 
2----------------------------------------------------- 
3--16--17-17-------------17------------17--- 
1--------------------------15------------------------------ 
2-------------------------------------------------------