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else {
   my $pos = -1;
...
   my $offset = $cPosns[rand @cPosns];
   $cell = sprintf '%.2f', popnum3( $x, $y, $copycop, $offset, );
}

sub popnum3 {
    my ( $x, $y, $z, $offset ) = @_;
...
    }
    return $aob[$x][$y];
}