Does the small fence look square?
Yes, the fence is square.
    src        edge_attr  dst
0     0   to the left of    2
1     0  to the right of    8
2     0  to the right of    3
3     0  to the right of    7
4     1   to the left of    5
5     2  to the right of    8
6     2  to the right of    7
7     2  to the right of    0
8     3   to the left of    0
9     3  to the right of    4
10    4   to the left of    7
11    4   to the left of    3
12    5  to the right of    1
13    7   to the left of    2
14    7   to the left of    0
15    7  to the right of    4
16    8   to the left of    0
17    8   to the left of    2