Which place is it?
It is a field.
    src        edge_attr  dst
0     0               on   21
1     1  to the right of   18
2     1   to the left of   19
3     4   to the left of   19
4     5   to the left of   19
5     7   to the left of   19
6     9  to the right of   12
7     9  to the right of   13
8    10               of   20
9    12   to the left of    9
10   12   to the left of   21
11   13   to the left of    9
12   16  to the right of   17
13   17   to the left of   16
14   18   to the left of    1
15   19  to the right of    4
16   19  to the right of    7
17   19  to the right of    5
18   19  to the right of    1
19   21  to the right of   12