B=

(a)  

C =

(a)  

D=

(a)  

E =

(a)  

F =

(a)  

G =

(a)  

H =

(a)  

I=

(a)  

J=

(a)  

K=

(a)  

L=

(a)  

M=

(a)  

N=

(a)