Z<-

Z

Y<-

Y

X<-

X

W<-

W

V<-

V

U<-

U

T<-

T

S<-

S

R<-

R

Q<-

Q

P<-

P

O<-

O

N<-

N

M<-

M

L<-

L

K

K

J<-

J

I<-

I

H<-

H

G

G

F

F

E<-

E

D<-

D

C<-

C

B<-

B<-

A<-

A<-