Is the ship to the right of the lighthouse on the left?
Yes, the ship is to the right of the light house.
    src        edge_attr  dst
0     1  to the right of    5
1     5   to the left of    6
2     5   to the left of    1
3     6   to the left of    7
4     6  to the right of    5
5     6   to the left of   10
6     6               on    9
7     7  to the right of    6
8    10  to the right of    6
9    11               of   13
10   11  to the right of   14
11   13               on   12
12   14   to the left of   11
13   15   on the side of   12