How long is the wood bench?
The bench is long.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of   10
2     2   to the left of    9
3     2  to the right of    4
4     2  to the right of    7
5     4   to the left of    2
6     4   to the left of   11
7     4   to the left of    6
8     4   to the left of   10
9     4               on    7
10    5   to the left of   10
11    5   to the left of   12
12    6  to the right of    4
13    6  to the right of    0
14    6  to the right of    7
15    6   to the left of    9
16    6               on    2
17    7   to the left of   10
18    7   to the left of    6
19    7   to the left of    2
20    7   to the left of   11
21    8               on    9
22    8  to the right of   15
23    9  to the right of    6
24    9  to the right of    2
25    9  to the right of   15
26   10  to the right of    0
27   10  to the right of    5
28   10  to the right of    7
29   10  to the right of    4
30   11  to the right of    4
31   11  to the right of    7
32   12  to the right of    5
33   12  to the right of   13
34   13   to the left of   12
35   15   to the left of    8
36   15   to the left of    9
37   15               on    1