1
Q
A
2
Q
A
3
Q
A
4
Q
A
5
Q
A
6
Q
A
7
Q
A
8
Q
A
9
Q
A
10
Q
A
11
Q
A
12
Q
A
13
Q
A
14
Q
A
15
Q
A
16
Q
A
This is
17
Q
A
18
Q
A
19
Q
A
20
Q
A
Angles of reflection are Half of those of the rotation symmetries
21
Q
Define the direct product
A
