Do the lips look thin?
Yes, the lips are thin.
   src        edge_attr  dst
0    4   to the left of    5
1    4  to the right of   12
2    5  to the right of    8
3    5  to the right of    4
4    5  to the right of   10
5    5  to the right of   12
6    8   to the left of    5
7   10   to the left of    5
8   12   to the left of    4
9   12   to the left of    5