Are there either bottles or shelves that are made of glass?
Yes, the bottle is made of glass.
   src        edge_attr  dst
0    2   to the left of    3
1    3  to the right of    8
2    3  to the right of    6
3    3  to the right of    2
4    4  to the right of    8
5    6   to the left of    3
6    7  to the right of    8
7    8   to the left of    7
8    8   to the left of    3
9    8   to the left of    4