






t
s
V
x

x




t

/

t




%

t
t
t
t
t
t

t
t
t
t
t
t
t
t
t
t
t
t
t

t
t
t
t
t


t
t
t
t
t
t
t
x
x
t
t
t
t
t
t
t
t
x

t
t
t
t
t
t
t
t
t
t

x
t
t
x

t
t
t
t
t
x
x
t
t
t
t

s




t
t
t
t
t
x
x

