What do the computer mouse and the cup have in common?
The color, both the computer mouse and the cup are black.
    src        edge_attr  dst
0     0   to the left of    4
1     1  to the right of    4
2     2               on    1
3     2  to the right of    4
4     3   to the left of    8
5     4               on    8
6     4  to the right of    0
7     4   to the left of    8
8     4   to the left of    2
9     4   to the left of    1
10    5   to the left of   11
11    6   to the left of   11
12    7   to the left of   10
13    7   to the left of   11
14    8  to the right of    3
15    8  to the right of    4
16   10  to the right of    7
17   11  to the right of    7
18   11  to the right of    5
19   11  to the right of    6