____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
__________
____12____4
____9_____2
__________x
____10____3
____8_____1
____12____3
____12____3
____12____3
____10____1
__________x
__________x
____7_____1
____8_____2
____9_____3
____10____4
__________x
__________x
