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The power spectral density of a real stationary random process $X(t)$ is given by $$ S_X (f)  = \begin{cases} \frac{1}{W}, & \mid f \mid \leq W \\ 0,  & \mid f \mid > W \end{cases}$$ The value of the expectation $E \left [ \pi X(t)X\left ( t-\frac{1}{4W} \right ) \right ]$ is __________.
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