What do both the suitcase and the pen have in common?
The color, both the suitcase and the pen are red.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of   10
2     0   to the left of    1
3     0   to the left of    7
4     0   to the left of    3
5     1  to the right of    0
6     1               on   10
7     3  to the right of    8
8     3  to the right of    0
9     5   to the left of    6
10    5   to the left of    9
11    5   to the left of   10
12    5   to the left of    7
13    6  to the right of    5
14    7  to the right of    0
15    7  to the right of    5
16    8   to the left of    3
17    9  to the right of    0
18    9  to the right of    5
19   10  to the right of    0
20   10  to the right of    5