Is this a gold train?
Yes, this is a gold train.
    src        edge_attr  dst
0     1  to the right of    3
1     1   to the left of    8
2     2  to the right of   12
3     2         close to   11
4     2  to the right of    7
5     3   to the left of    1
6     3   to the left of    8
7     7   to the left of    2
8     8  to the right of    1
9     8  to the right of    3
10   12   to the left of    2