22 34

a b c d e f g h i j k l m n o p q r s t u v 


s a 1
s b 1 
s c 1 
s d 1 
s e 1 
a f 1 
a g 1 
b f 1 
b h 1 
c g 1 
c i 1 
d h 1 
e i 1 
f j 1 
g l 1 
h j 1 
i k 1 
j k 1
j m 1 
j n 1 
k v 1 
l o 1 
l p 1 
m p 1 
m q 1 
n q 1 
n r 1 
n u 1 
o t 1 
p t 1 
q t 1 
r t 1 
u t 1 
v t 1 
s t