/
/--/ ------------------------------ -+----\
| 29 28 27 25 24 22 / | |
| \ 20 26 23 / |21 |
| \ | |
| 4 | |
| | 19 18 17 16 15 14 13 |
| 3 | --------------------------------- |
| | 30 31 32 33 34 35 36 |
| 2 | |
| | |
| 1 | 5 6 7 8 +-+ 9 10 11 12 |
\-----+-------------------/ \-----------------/