Is the car dark?
Yes, the car is dark.
    src        edge_attr  dst
0     0  to the right of   14
1     0   to the left of    8
2     0  to the right of   12
3     1  to the right of   10
4     2   to the left of   13
5     2   to the left of   11
6     5  to the right of    7
7     6  to the right of    7
8     7   to the left of    6
9     7   to the left of    5
10    8  to the right of   12
11    8  to the right of    0
12    8  to the right of   14
13    9   to the left of   11
14   10   to the left of    1
15   11  to the right of    2
16   11  to the right of    9
17   12   to the left of    8
18   12   to the left of    0
19   13  to the right of    2
20   14   to the left of    0
21   14   to the left of    8