Is the tower made out of brick or steel?
The tower is made of brick.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of   16
2     0   to the left of   14
3     0  to the right of    5
4     1  to the right of   10
5     1   to the left of   14
6     2  to the right of    0
7     2   to the left of   11
8     5   to the left of    8
9     5  to the right of    6
10    5   to the left of    0
11    6   to the left of    5
12    6   to the left of    8
13    7               on    8
14    7   to the left of   14
15    8  to the right of    5
16    8  to the right of    6
17    8  to the right of   15
18    8  to the right of   10
19    8  to the right of    9
20    9   to the left of    8
21    9   to the left of   15
22    9   to the left of   12
23   10   to the left of    1
24   10   to the left of    8
25   11  to the right of   16
26   11  to the right of    2
27   12  to the right of    9
28   12  to the right of   15
29   12   to the left of   14
30   12   to the left of   13
31   13   to the left of   14
32   13  to the right of   12
33   13  to the right of   15
34   14  to the right of    0
35   14  to the right of    1
36   14  to the right of    7
37   14  to the right of   13
38   14  to the right of   12
39   14  to the right of   15
40   15   to the left of   13
41   15   to the left of   14
42   15   to the left of    8
43   15   to the left of   12
44   15  to the right of    9
45   16  to the right of    0
46   16   to the left of   11