Which color does the tail have?
The tail has red color.
    src        edge_attr  dst
0     0               of   13
1     0   to the left of    6
2     0   to the left of    1
3     1  to the right of   13
4     1  to the right of    0
5     2   to the left of    6
6     3           behind   10
7     5  to the right of   12
8     6  to the right of    0
9     6  to the right of   13
10    6  to the right of    2
11    6               of   13
12    7  to the right of    9
13    7  to the right of   10
14    8   to the left of   11
15    8  to the right of    9
16    9   to the left of    7
17    9   to the left of    8
18   10      in front of    3
19   10   to the left of    7
20   11  to the right of    8
21   12   to the left of    5
22   13   to the left of    6
23   13   to the left of    1