n n k n k
n
n
a b
a b
p
a b
a b
p
a b
a b
p
a b
a b
p
a b
a b
p
p
b
b
p
p
p
p
a
a b c
a b c
p
a b c
a b c
p
a b c
a b c
a b c
p
abc
a b c
a b c
p
p
p
p
p
p
p
p
p
p
p
a b
a b
p
a b
a b
p
k
p
a b
p
a b
p
k
k
k
r r
r
p
k
k
k
p
p
a b
a b
k
nnn n n
n n
