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#!/usr/bin/perl -w
use strict;
...
    sqrt( ($d{shuffl}{Ex2} - ($d{shuffl}{Ex}**2/24))/23 );

__END__

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C:\test>199981 -size=100 -iter=100000
Benchmark: running FAQ_FY, shuffl, each for at least 1 CPU seconds...
...
Std. Dev.   |  72.382 |  67.643

C:\test>