What is the color of the zebra in front of the other zebra?
The zebra is black.
    src         edge_attr  dst
0     0   to the right of   14
1     1            behind   16
2     3   to the right of   11
3     3   to the right of   13
4     4    to the left of   19
5     4    to the left of    9
6     4   to the right of    7
7     5    to the left of   13
8     6    to the left of    9
9     6    to the left of   19
10    7    to the left of    4
11    8    to the left of   13
12    9   to the right of    6
13    9       in front of   20
14    9   to the right of   13
15    9   to the right of    4
16   11   to the right of   13
17   11    to the left of    3
18   13    to the left of   19
19   13   to the right of    5
20   13   to the right of    8
21   13    to the left of   11
22   13    to the left of    9
23   13    to the left of    3
24   14    to the left of    0
25   15   to the right of   20
26   16       in front of    1
27   19       in front of   20
28   19                on   17
29   19            eating   17
30   19   to the right of    4
31   19   to the right of    6
32   19   to the right of   13
33   19   to the right of   20
34   20            behind   19
35   20    to the left of   15
36   20                on   17
37   20    to the left of   19
38   20  standing next to   19