Is the color of the bun different than that of the sandwich?
No, both the bun and the sandwich are white.
   src        edge_attr  dst
0    0   to the left of    7
1    0   to the left of    6
2    0   to the left of    8
3    4   to the left of    6
4    6  to the right of    4
5    6  to the right of    0
6    7   to the left of    8
7    7  to the right of    0
8    8  to the right of    7
9    8  to the right of    0