(
ρ
v
a
h
e
r
(
a
3
−
S
a
)
+
ρ
l
i
i
v
S
h
)
g
=
ρ
v
e
s
i
g
a
2
A
(
ρ
v
a
h
e
r
(
a
3
−
S
a
)
+
ρ
l
i
i
v
S
h
)
g
=
ρ
v
e
s
i
g
a
2
A
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