____3_____opt.
____5_____4
____4_____2
____5_____3
____3_____1
__________x
____0_____0
____0_____0
____0_____0
____2_____2
____3_____3
__________x
__________x
____8_____3
____9_____4
____9_____3
__________x
____8_____1
____7_____1
____8-____2
____9-____3
____10____4
__________X
__________X
____15____opt.
____17____4
____16____2
____17____3
____15____1
__________x
____12____1
____12____2
____12____3
____10____4
__________x
__________x
