Are the cart and the roof made of the same material?
No, the cart is made of wood and the roof is made of metal.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of    1
2     1   to the left of   11
3     1   to the left of    5
4     1   to the left of   20
..  ...              ...  ...
77   18               on    2
78   18  to the right of   13
79   18   to the left of    4
80   18  to the right of   16
81   20  to the right of    1

[82 rows x 3 columns]