Which material was used to make the black purse?
The purse is made of leather.
    src        edge_attr  dst
0     1             near    3
1     1   to the left of    4
2     1  to the right of    7
3     1  to the right of    6
4     2   to the left of    4
5     2             near    6
6     3             near    1
7     3          next to    1
8     3   to the left of    5
9     3   to the left of    4
10    4  to the right of    3
11    4        on top of    5
12    4             near    5
13    4  to the right of    2
14    4  to the right of    1
15    5  to the right of    3
16    5          next to    4
17    5               on    1
18    6          next to    2
19    6           beside    2
20    6   to the left of    1
21    7   to the left of    1