What is located on top of the skateboard that looks old?
The shoe is on top of the skateboard.
    src        edge_attr  dst
0     0  to the right of    5
1     2  to the right of    4
2     2  to the right of   16
3     4   to the left of    2
4     4   to the left of   17
5     4   to the left of   12
6     5   to the left of    0
7     7          next to   10
8     7             near   10
9     8        on top of    6
10   10             near    7
11   12  to the right of    4
12   16   to the left of    2
13   17      standing on    6
14   17          wearing   15
15   17  to the right of    4
16   17        riding on    6