for ($results = 2; $results <34; $results++) {
            my $file="current$results.res";
            open (TALLYRESULTS, ">$file") or die ("cant open results file");
              ....
            }
        

##</code><code>##

for ($results = 2; $results <34; $results++) {
                my $file="current".$presence.".res";
                ....
                }

##</code><code>##

 @tree1=@samples[0..2];
  ...  (another 10 of those)
 @tree12=@samples[33..35];
                                        
 for ($z = 1; $z <= 12; $z++) {
 $arrayname="tree$z";
 foreach $patch(@$arrayname) {
       ... do something
       }

##</code><code>##

 my %trees = (1 => "@samples[0..2]", 
                          ... (another 10 of these)
                        12 => "@samples[33..35]",
                         );
                        
while ((my $tree, my $samples) = each (%trees) ){
               my @patches = split (/ */, $samples);
                foreach $patch(@patches) {
                             ... do something
                 }