open(N148,'<',"148Nsorted.bed") or die $!;
my @Sample148N = <N148>;
close(N148);

open(N162,'<',"162Nsorted.bed") or die $!;
my @Sample162N = <N162>;
close(N162);

open(N174,'<',"174Nsorted.bed") or die $!;
my @Sample174N = <N174>;
close(N174);

open(N175,'<',"175Nsorted.bed") or die $!;
my @Sample175N = <N175>;
close(N175);

my @results;
my $start;
my $end;
my $overlap = "no-overlap";
my $option1 = ($end148-$start162 >= 1 && $end162 > $end148) && ($end174 - $start148 > 1 && $start174 < $start148) && ($start175 > $start148 && $end148 > $end175);
my $option2 = ($end148-$start162 >= 1 && $end162 > $end148) && ($end175 - $start148 > 1 && $start175 < $start148) && ($start174 > $start148 && $end148 > $end174);
my $option3 = ($end148-$start174 >= 1 && $end174 > $end148) && ($end175 - $start148 > 1 && $start175 < $start148) && ($start162 > $start148 && $end148 > $end162);
my $option4 = ($end148-$start175 >= 1 && $end175 > $end148) && ($end174 - $start148 > 1 && $start174 < $start148) && ($start162 > $start148 && $end148 > $end162);
my $option5 = ($end148-$start174 >= 1 && $end174 > $end148) && ($end162 - $start148 > 1 && $start162 < $start148) && ($start175 > $start148 && $end148 > $end175);
my $option6 = ($end148-$start175 >= 1 && $end175 > $end148) && ($end162 - $start148 > 1 && $start162 < $start148) && ($start174 > $start148 && $end148 > $end174);

my $option7 = ($end162-$start148 >= 1 && $end148 > $end162) && ($end174 - $start162 > 1 && $start174 < $start162) && ($start175 > $start162 && $end162 > $end175);
my $option8 = ($end162-$start148 >= 1 && $end148 > $end162) && ($end175 - $start162 > 1 && $start175 < $start162) && ($start174 > $start162 && $end162 > $end174);
my $option9 = ($end162-$start174 >= 1 && $end174 > $end162) && ($end175 - $start162 > 1 && $start175 < $start162) && ($start148 > $start162 && $end162 > $end148);
my $option10 = ($end162-$start175 >= 1 && $end175 > $end162) && ($end174 - $start162 > 1 && $start174 < $start162) && ($start148 > $start162 && $end162 > $end148);
my $option11 = ($end162-$start174 >= 1 && $end174 > $end162) && ($end148 - $start162 > 1 && $start148 < $start162) && ($start175 > $start162 && $end162 > $end175);
my $option12 = ($end162-$start175 >= 1 && $end175 > $end162) && ($end148 - $start162 > 1 && $start148 < $start162) && ($start174 > $start162 && $end162 > $end174);

my $option13 = ($end174-$start162 >= 1 && $end162 > $end174) && ($end148 - $start174 > 1 && $start148 < $start174) && ($start175 > $start174 && $end174 > $end175);
my $option14 = ($end174-$start162 >= 1 && $end162 > $end174) && ($end175 - $start174 > 1 && $start175 < $start174) && ($start148 > $start174 && $end174 > $end148);
my $option15 = ($end174-$start148 >= 1 && $end148 > $end174) && ($end175 - $start174 > 1 && $start175 < $start174) && ($start162 > $start174 && $end174 > $end162);
my $option16 = ($end174-$start175 >= 1 && $end175 > $end174) && ($end148 - $start174 > 1 && $start148 < $start174) && ($start162 > $start174 && $end174 > $end162);
my $option17 = ($end174-$start148 >= 1 && $end148 > $end174) && ($end162 - $start174 > 1 && $start162 < $start174) && ($start175 > $start174 && $end174 > $end175);
my $option18 = ($end174-$start175 >= 1 && $end175 > $end174) && ($end162 - $start174 > 1 && $start162 < $start174) && ($start148 > $start174 && $end174 > $end148);

my $option19 = ($end175-$start162 >= 1 && $end162 > $end175) && ($end174 - $start175 > 1 && $start174 < $start175) && ($start148 > $start175 && $end175 > $end148);
my $option20 = ($end175-$start162 >= 1 && $end162 > $end175) && ($end148 - $start175 > 1 && $start148 < $start175) && ($start174 > $start175 && $end175 > $end174);
my $option21 = ($end175-$start174 >= 1 && $end174 > $end175) && ($end148 - $start175 > 1 && $start148 < $start175) && ($start162 > $start175 && $end175 > $end162);
my $option22 = ($end175-$start148 >= 1 && $end148 > $end175) && ($end174 - $start175 > 1 && $start174 < $start175) && ($start162 > $start175 && $end175 > $end162);
my $option23 = ($end175-$start174 >= 1 && $end174 > $end175) && ($end162 - $start175 > 1 && $start162 < $start175) && ($start148 > $start175 && $end175 > $end148);
my $option24 = ($end175-$start148 >= 1 && $end148 > $end175) && ($end162 - $start175 > 1 && $start162 < $start175) && ($start174 > $start175 && $end175 > $end174);

for my $line(@Sample148N){

    my($chr148,$start148,$end148) = split("\t",$line);
   
    for my $line2(@Sample162N){
        my($chr162,$start162,$end162) = split("\t",$line2);

        
        for my $line3(@Sample174N){
            my($chr174,$start174,$end174) = split("\t",$line3);
            
            for my $line4(@Sample175N){
                my($chr175,$start175,$end175) = split("\t",$line2);
                
                if(($chr148 eq $chr162 && $chr148 eq $chr174 && $chr148 eq $chr175) && ($option1 || $option2 || $option3 || $option4 || $option5 || $option6 || $option7 || $option8 || $option9 || $option10 || $option11 || $option12 || $option13 || $option14 || $option15 || $option16 || $option17 || $option18 || $option19 || $option20 || $option21 || $option22 || $option23 || $option24){
                    $overlap = "overlap";
                    
                    $start = $start148 if ($start148 < $start162 && $start148 <$start174 && $start148 < $start175);
                    $end = $end148 if ($end148 > $end162 && $end148 > $end174 && $end148 > $end175);
                    $start = $start162 if ($start162 < $start148 && $start162 <$start174 && $start162 < $start175);
                    $end = $end162 if ($end162 > $end148 && $end162 > $end174 && $end162 > $end175);
                    $start = $start174 if ($start174 < $start162 && $start174 <$start148 && $start174 < $start175);
                    $end = $end174 if ($end174 > $end162 && $end174 > $end148 && $end174 > $end175);
                    $start = $start175 if ($start175 < $start148 && $start175 <$start174 && $start175 < $start162);
                    $end = $end175 if ($end175 > $end148 && $end175 > $end174 && $end175 > $end162);
            
        }
    }
   print "$chr148   $start  $end";
}