What color do the words have?
The words have black color.
   src        edge_attr  dst
0    0      in front of    5
1    0  to the right of    8
2    4           beside    7
3    5           behind    0
4    6  to the right of   10
5    7               on    3
6    8   to the left of    0
7   10   to the left of    6