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#!/usr/bin/perl
use strict;
use warnings;
...

print @{$row[2]}, "\n";
print @{$row[3]}, "\n";

sub popnum3 {
    use Data::Dumper;
    my ( $x, $y, $z ) = @_;
...
    $aob[$x][$y] = $mean * ( 1 + $z );
    return $aob[$x][$y];
}