____1_____1 opt.
____4_____4
____2_____2
____1_____1
____3_____3
____1_____1
__________x
____13____3
____14____4
____13____2
__________x
____13____1
__________x
____1_____3
____2_____4
____1_____2
__________x
____1_____1
____5_____4
____4_____2
____5_____3
____3_____1
__________x
__________x
__________x
____6_____1
____8_____4
____7_____2
____8_____3
__________x
____8_____1
____10____4
____8_____1
____10____3
____8_____1
__________x
__________x
____4_____1
____5_____2
____7_____3
____8_____4
__________x
