What is the shoe lace tied around?
The shoe lace is tied around the street sign.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    1
2     1   to the left of    0
3     1  to the right of    4
4     1  on the front of    7
5     2  to the right of    4
6     3  to the right of    4
7     4   to the left of    6
8     4   to the left of    3
9     4   to the left of    1
10    4   to the left of    2
11    4   to the left of    5
12    4   to the left of    7
13    5      tied around    7
14    5  to the right of    4
15    6     hanging from    7
16    6  to the right of    4
17    7  to the right of    4
18    7   to the left of    0