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