20 



KANSAS UNIVERSITY QUARTERLY. 



X 



y 



aZ 



X, 



a^z, 



ay, 



a^X, 

 Z, 



y. 



ttX, 



X, 



Z, a-^Z, 



Xj=Z, z, 



yi=y. ay. 



Zj=x, a^X, 



Z, a-Z, aZ, Z, Z, Z, Z 



a^y, y. y, a'^y, cy, y. y 



ax, X, X, X, X, a'-X, aX 



x,=y, 

 yi=z, 



Z,=rX, 



y. 



aZ, 

 a'X. 



a-^Z, 

 ax. 



■1 ■ 



=z, 



yi=x, 

 Zi=y, 



z, 



aX, 



a^y, 



z, 



a-'Z, 



a-^X, X, 



ay. y, 



aZ, Z, 

 X, a^X, 



y, y. 



z, 



ax, 



z, z 



X, X 



a-y, ay 



