What is the color of the leaves?
The leaves are dark brown.
    src        edge_attr  dst
0     0  to the right of   15
1     0   to the left of   14
2     0   to the left of    1
3     1  to the right of   15
4     1  to the right of    0
5     2  to the right of   12
6     2  to the right of   16
7     3   to the left of    9
8     3   to the left of    5
9     5  to the right of   16
10    5  to the right of    3
11    5  to the right of   12
12    5   to the left of   13
13    9  to the right of    3
14   12   to the left of    5
15   12   to the left of   13
16   12   to the left of    2
17   12  to the right of   16
18   13  to the right of   12
19   13  to the right of    5
20   14  to the right of   15
21   14  to the right of    0
22   15   to the left of    0
23   15   to the left of    1
24   15   to the left of   14
25   16   to the left of    2
26   16   to the left of    5
27   16   to the left of   12