____1_____1
____2_____2
____1_____1
____3_____3
____4_____4
__________x
____4_____1 opt.
____6_____3
____6_____3
____6_____3
____4_____1
__________x
____9_____4 opt.
____6_____1
____6_____1
____6_____1
____8_____2
____9_____3
____9_____1
____9_____1
____10____2
____11____4
____11____3
____9_____1
____13_____3
____14_____4
____13_____2
____11_____1
___________x
___________x
____13_____1
____14_____2
____13_____1
____15_____3
____16_____4
___________x
