What is the container made of?
The container is made of glass.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    2
2     1   to the left of    7
3     1   to the left of    2
4     1  to the right of    6
5     2  to the right of    1
6     2  to the right of    8
7     2  to the right of    3
8     2  to the right of    5
9     2  to the right of    0
10    3   to the left of    2
11    5               of    1
12    5   to the left of    7
13    5   to the left of    2
14    6   to the left of    1
15    7  to the right of    1
16    7  to the right of    0
17    7  to the right of    8
18    7  to the right of    5
19    8   to the left of    7
20    8   to the left of    2