____1_____1
____2_____2
____3_____3
____4_____4
__________x
__________x
__________
____2_____4
____3_____3
____3_____2
__________x
____2_____1
____6_____3
____6_____3
____6_____3
____4_____1
__________x
__________x
_____9____1 opt.
____11____4
____10____2
____11____3
_____9____1
__________x
____13____1
____14____2
____15____3
____16____4
__________x
__________x
__________
____14____2
____15____4
____15____3
__________x
____14____1
