How large is the elephant in the middle?
The elephant is large.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    1
2     1   to the left of    0
3     1   to the left of    7
4     1   to the left of    3
5     1   to the left of    2
6     1   to the left of    5
7     1   to the left of    4
8     2  to the right of    1
9     3   to the left of    9
10    3  to the right of    1
11    4  to the right of    7
12    4  to the right of    1
13    5  to the right of    1
14    7   to the left of    9
15    7   to the left of    0
16    7  to the right of    1
17    7   to the left of    4
18    7   to the left of    8
19    8  to the right of    7
20    9  to the right of    3
21    9  to the right of    7