Is that cross made of stone?
Yes, the cross is made of stone.
   src        edge_attr  dst
0    0  to the right of    2
1    2               of    6
2    2   to the left of    0
3    2  to the right of    3
4    3   to the left of    2
5    3   to the left of    6
6    6  to the right of    3