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Per my understanding of these comments, the question's test takes $\ell=64$ bytes from a Windows RNGCryptoServiceProvider, makes it $n=2\ell=128$ groups of $b=4$ bits, counts the number $n_i$ of groups with each of the $2^b=16$ bit patterns $i$, computes $p_i=n_i/n$, and for a limit $x=0.9$ checks $$x\le-\frac1b\sum_{p_i\ne0}p_\,\log_2\left(p_i\right)$$ The ...


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