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