c
2
t
2
0
=
c
2
t
2
–
v
2
t
2
=
(
c
2
–
v
2
)
t
2
c
2
t
0
2
=
c
2
t
2
–
v
2
t
2
=
(
c
2
–
v
2
)
t
2
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