____8_____opt.
____10____4
____9_____2
____10____3
____8_____1
__________x
__________x
____1_____2
____2_____4
____2_____3
__________x
____1_____0
__________x
____13____3
____14____4
____14____3
__________x
____13____1
__________
____17____4
____14____2
__________x
____15____3
____13____1
____17____3
____17____3
____17____3
____15____1
__________x
__________x
____12____1
____13____2
____14____3
____15____4
__________x
__________x
