Which material do you think was used to make the floor, cement or hardwood?
The floor is made of cement.
    src        edge_attr  dst
0     0  to the right of   16
1     0  to the right of    8
2     1   to the left of   12
3     3   to the left of   12
4     3   to the left of   11
5     4   to the left of    6
6     6  to the right of    4
7     7  to the right of   10
8     8  to the right of   14
9     8   to the left of    0
10    9  to the right of   10
11   10   to the left of    9
12   10   to the left of    7
13   11  to the right of    3
14   12  to the right of    1
15   12  to the right of    3
16   14   to the left of   16
17   14   to the left of    8
18   15   to the left of   16
19   16  to the right of   15
20   16  to the right of   14
21   16   to the left of    0