Who is walking?
The shoppers are walking.
    src        edge_attr  dst
0     0   to the left of   12
1     1  to the right of    8
2     1   to the left of    2
3     1   to the left of    3
4     2  to the right of    1
5     2  to the right of    8
6     3  to the right of    8
7     3  to the right of    1
8     3  to the right of    6
9     3  to the right of    4
10    3   to the left of   12
11    4   on the side of    7
12    4   to the left of    3
13    5   to the left of   11
14    5  to the right of    9
15    6   to the left of    3
16    7   to the left of   12
17    8   to the left of    3
18    8   to the left of    2
19    8   to the left of    1
20    9   to the left of    5
21   10       walking on   11
22   11  to the right of    5
23   12  to the right of    7
24   12  to the right of    0
25   12  to the right of    3