How tall is the grass?
The grass is tall.
    src        edge_attr  dst
0     0       covered by    3
1     1  to the right of    6
2     2  to the right of    9
3     2  to the right of    4
4     3         covering    0
5     4   to the left of    9
6     4  to the right of   11
7     4  to the right of   10
8     4   to the left of    2
9     5   to the left of   18
10    5   to the left of   12
11    5               on    0
12    5   to the left of    6
13    6  to the right of    5
14    6   to the left of    1
15    6               in   15
16    6   to the left of   16
17    6      followed by   16
18    9  to the right of   11
19    9  to the right of   10
20    9               in   15
21    9  to the right of    4
22    9   to the left of    2
23   10   to the left of    9
24   10   to the left of    4
25   11   to the left of    4
26   11   to the left of    9
27   12  to the right of    5
28   12   to the left of   17
29   16        following    6
30   16  to the right of    6
31   17               of    6
32   17  to the right of   12
33   18  to the right of    5
34   18               of    6