2. D-D₃=DS=D₃

9 free grades example 3. D

1 free grade example 4. DS

2 free grades example 5. D₂

2 free grades example 6. D₃

3 free grades example 7. DS₂

3 free grades example 8. D₃S₂

5 free grades example 9. S

1 free grade example 10. DS

2 free grades example 11. D₂S₂

4 free grades example 12. D₃S

4 free grades example 13. W

1 free grade example 14. S₂

2 free grades example 1. D₂S

3 free grades example