What color do you think the trunks are?
The trunks are red.
    src        edge_attr  dst
0     2  to the right of    7
1     2   to the left of    6
2     2  to the right of   10
3     4   to the left of    6
4     5               in    9
5     6  to the right of    4
6     6  to the right of    2
7     6  to the right of   10
8     6  to the right of    7
9     7   to the left of    6
10    7   to the left of    2
11   10   to the left of    6
12   10   to the left of    2