What do the dog and the shoe have in common?
The color, both the dog and the shoe are black.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   15
2     0   to the left of    4
3     1   to the left of   14
4     1  to the right of    2
5     1  to the right of    9
6     1   to the left of   16
7     2  to the right of    6
8     2   to the left of   15
9     2   to the left of    1
10    2   to the left of    3
11    2   to the left of   16
12    3  to the right of    2
13    3       sitting on    5
14    3   to the left of   16
15    3  to the right of    8
16    3   to the left of   15
17    3  to the right of    9
18    3   to the left of   12
19    3   to the left of   14
20    4  to the right of   15
21    4  to the right of    0
22    6   to the left of    2
23    8   to the left of    9
24    8   to the left of    3
25    9   to the left of    1
26    9  to the right of    8
27    9   to the left of   15
28    9   to the left of    3
29   12  to the right of   16
30   12  to the right of    3
31   12  to the right of    0
32   12  to the right of   15
33   13   to the left of   17
34   14  to the right of    3
35   14  to the right of   15
36   14  to the right of   16
37   14  to the right of    1
38   15   to the left of   12
39   15  to the right of    0
40   15  to the right of    2
41   15   to the left of   14
42   15  to the right of    3
43   15   to the left of    4
44   15  to the right of    9
45   16  to the right of    3
46   16   to the left of   17
47   16  to the right of    2
48   16   to the left of   14
49   16  to the right of    1
50   16   to the left of   12
51   17  to the right of   16
52   17  to the right of   13