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  1. or download this
    $query = "select * from finalLevel3 where id=\"$ID\";";
$sth = $dbh -> prepare($query);

# I would suggest this:
my $query = $dbh->prepare("SELECT * FROM finalLevel3 WHERE id='$ID'");
  2. or download this
     foreach $item (@{$clusters}) {
 #.....
 }
  3. or download this
     
foreach my $cluster (@$clusters) {                                 
#.....
}
  4. or download this
     
my @list = @{listRefReturningFunction()};
#also consider:
...
my $xref=\@x;
print @$xref;       #prints 1234 also
                    #this works because there is no subscript