What color are the tiles?
The tiles are black.
    src        edge_attr  dst
0     0               on    9
1     1   to the left of   12
2     1               on    9
3     2   to the left of   12
4     4               on    0
5     6   to the left of   12
6     8               on   10
7    11               on    0
8    12  to the right of    2
9    12  to the right of    1
10   12  to the right of    6
11   14               in   15