t (1/2) T T t(1/2)
m t(1/2) m t(1/2)
---------------- -----------------
m T m T
t(1/2) T T t(1/2)
t(1/2) m t(1/2) m
---------------- -------------------
m T m T
m t(1/2) m t(1/2)
---------------- -----------------
m T m T
t(1/2) T T t(1/2)
t(1/2) m t(1/2) m
---------------- -------------------
m T m T
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