____3_____1
____5_____4
____3_____1
____5_____3
____3_____1
__________x
__________x
____1_____1
____3_____4
____2_____2
____3_____3
__________x
__________x
____8_____3
____9_____4
____8_____2
__________x
____8_____1
____8_____opt.
____11____4
____9_____2
____8_____1
____10____3
____8_____1
____12____4
____11____2
____12____3
____10____1
__________x
__________x
____6_____1
____8_____2
____9_____3
____10____4
__________x
__________x
