a 1 0 0
b 0 1 0
c 0 1 0
d 0 1 0
e 0 1 0
f 0 0 1
g 0 0 1
h 0 0 1
i 0 0 1
j 0 0 1
k 0 0 1
l 0 0 1
m 0 0 1