Point Group D
2
Quaternary direct products
A⊙A⊙
⊙
A
B
1
B
2
B
3
A
A
B
1
B
1
A
B
2
B
2
B
3
A
B
3
B
3
B
2
B
1
A
A⊙B
1
⊙
⊙
B
1
B
2
B
3
B
1
B
1
B
2
B
2
B
1
B
3
B
3
A
B
1
A⊙B
2
⊙
⊙
B
2
B
3
B
2
B
2
B
3
B
3
B
2
A⊙B
3
⊙
⊙
B
3
B
3
B
3
B
1
⊙B
1
⊙
⊙
B
1
B
2
B
3
B
1
A
B
2
B
3
A
B
3
B
2
B
1
A
B
1
⊙B
2
⊙
⊙
B
2
B
3
B
2
B
3
B
3
B
2
B
3
B
1
⊙B
3
⊙
⊙
B
3
B
3
B
2
B
2
⊙B
2
⊙
⊙
B
2
B
3
B
2
A
B
3
B
1
A
B
2
⊙B
3
⊙
⊙
B
3
B
3
B
1
B
3
⊙B
3
⊙
⊙
B
3
B
3
A