Spin6 blocks

Block Sizes in Compact Inner Class:
           PSO(5,1)  PSO(3,3)
Spin(6)    0         1
Spin*(6)   0         10
Spin(4,2)  3         21 

Block Sizes in Split Inner Class:
           PSO(6)  PSO*(6)  PSO(4,2)
Spin(5,1)  0       0        3
Spin(3,3)  1       10       15