or download this
#!/usr/bin/perl -ws
use strict;
use vars qw/$size $iter/;
...
# sqrt( ($d{FAQ_FY}{Ex2} - ($d{FAQ_FY}{Ex}**2/5040))/5039 ),
# sqrt( ($d{shuffl}{Ex2} - ($d{shuffl}{Ex}**2/5040))/5039 ),
# sqrt( ($d{supffl}{Ex2} - ($d{supffl}{Ex}**2/5040))/5039 );