Which color is the vegetable to the left of the bread?
The lettuce is dark.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    2
2     0  to the right of    6
3     1  to the right of    6
4     2  to the right of    8
5     2  to the right of    6
6     2  to the right of    0
7     3  to the right of    4
8     3  to the right of   11
9     3  to the right of   10
10    4   to the left of    3
11    4  to the right of   11
12    4  to the right of    0
13    4  to the right of    8
14    4  to the right of    6
15    6   to the left of    7
16    6   to the left of    0
17    6   to the left of   11
18    6   to the left of    2
19    6   to the left of    1
20    6   to the left of    9
21    6   to the left of   10
22    6   to the left of    4
23    7  to the right of    6
24    8   to the left of    4
25    8   to the left of   10
26    8   to the left of    2
27    8   to the left of    9
28    9  to the right of    6
29    9  to the right of    8
30   10               of   11
31   10  to the right of    6
32   10  to the right of    8
33   10   to the left of    3
34   11   to the left of    4
35   11  to the right of    6
36   11   to the left of    3