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    \item[$\star$] 65 comparisons Bose and Nelson (1962).
    \item[$\star$] 63 by Batcher and by Floyd and Knuth (1964).
    \item[$\star$] 62 by Shapiro (1969)
    \item[$\star$] 60 by Green (1969)
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\noindent
See the Figure bellow. 

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\caption{Batcher's proposition of sorting network with 63 comprisons (1964)}
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