What is the aircraft in the sky?
The aircraft is a helicopter.
    src        edge_attr  dst
0     0  to the right of    7
1     1  to the right of    5
2     1  to the right of    6
3     2  to the right of    7
4     2               of    4
5     2   to the left of    6
6     2   to the left of    5
7     3  to the right of    5
8     4               in    7
9     4  to the right of    7
10    5   to the left of    1
11    5   to the left of    3
12    5  to the right of    7
13    5  to the right of    2
14    6  to the right of    7
15    6  to the right of    2
16    6   to the left of    1
17    7   to the left of    0
18    7   to the left of    4
19    7   to the left of    5
20    7   to the left of    6
21    7   to the left of    2