Is the mat gray or yellow?
The mat is gray.
    src        edge_attr  dst
0     0               of    9
1     0  to the right of    4
2     0  to the right of    3
3     1               of    9
4     2               of    9
5     3   to the left of    4
6     3   to the left of    0
7     4               of    9
8     4   to the left of    0
9     4  to the right of    3
10    5               of    9