zone
00001  top
nnum
                    4
         5          6          7          8
00002  bottom
nnum
                    4
         1          2          3          4
00003  left_w
nnum
                    4
         1          3          5          7
00005  right_e
nnum
                    4
         2          4          6          8
00006  back_n
nnum
                    4
         3          4          7          8
00004  front_s
nnum
                    4
         1          2          5          6
 
stop