What's on the table?
The cards are on the table.
   src        edge_attr  dst
0    1           beside    0
1    2   to the left of    5
2    2   to the left of    4
3    3               on    7
4    4   to the left of    5
5    4  to the right of    2
6    5  to the right of    4
7    5  to the right of    2