Is there a table or a couch that is not black?
No, there is a table but it is black.
   src        edge_attr  dst
0    0   to the left of    2
1    1  to the right of    4
2    1   to the left of    7
3    2  to the right of    0
4    4   to the left of    1
5    7  to the right of    1