Which place is it?
It is a field.
    src        edge_attr  dst
0     1  to the right of    6
1     3  to the right of   11
2     3  to the right of    7
3     3  to the right of   12
4     6   to the left of    7
5     6   to the left of    9
6     6   to the left of    8
7     6   to the left of    1
8     7   to the left of    3
9     7  to the right of   15
10    7  to the right of    6
11    8  to the right of    6
12    9  to the right of    6
13   10  to the right of   13
14   11   to the left of    3
15   12   to the left of    3
16   13   to the left of   10
17   15   to the left of    7