a
b
c
e
a
b
g
a
b
c
e
a
b
c
f
a
b
c
e
a
b
c
f
a
b
c
e
a
b
c
f
f
a
b
c
f
f
a
b
c
g
a
b
g
g
b
b
b
b
b
a
b
c
e
a
b
g
a
b
c
e
a
b
c
f
a
b
c
e
a
b
c
f
a
b
c
e
a
b
c
f
f
a
b
c
f
f
a
b
c
g
a
b
g
g