Hi monkers, i humbly seek your advice for a syntax error that im not able to spot in my code for hours.

#!/usr/bin/perl

use 5.010;
use strict;
use warnings;
open BLOCKS,'blocks.txt';
open START,'start.txt';
open STOP,'stop.txt';
open NP,'np.txt';
open TRIPLET,'>triplet.txt';
my @blocks=<BLOCKS>;
my @start=<START>;
my @stop=<STOP>;
my @np=<NP>;
chomp @blocks;
chomp @start;
chomp @stop;
chomp @np;
my $i;
my $index=0;
my $first;
my $second;
my $third;
my $a=0;
my $b=1;
my $c=3;
my $flag;
for($i=0;$i<(scalar(@blocks));$i++)
{
    if($blocks[$index]=~m/^\d.+/)
    {
        if ($blocks[$a]=~m/^\d.+/ and $blocks[$b]=~m/^\d.+/ and $block
+s[$c]=~m/^\d.+/)
        {
            if($np[$a] eq $np[$b] || $np[$a] eq $np[$b] || $np[$b] eq 
+$np[$c])
            {
            
                if ($np[$a] eq $np[$b])
                {
                    $flag=$np[$a];
                    print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$fl
+ag\n";
                    print TRIPLET "$start[$b]\t$stop[$b]\t$np[$b]\t$fl
+ag\n";
                    print TRIPLET "$start[$c]\t$stop[$c]\t$np[$c]\t$fl
+ag\n";
                }
                else
                {
                    $flag=$np[$c];
                    print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$fl
+ag\n";
                    print TRIPLET "$start[$b]\t$stop[$b]\t$np[$b]\t$fl
+ag\n";
                    print TRIPLET "$start[$c]\t$stop[$c]\t$np[$c]\t$fl
+ag\n";
                }
                
            }
            else
            {
                #ambigious data
                print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$np[$a]
+\n";
                print TRIPLET "$start[$b]\t$stop[$b]\t$np[$b]\t$np[$b]
+\n";
                print TRIPLET "$start[$c]\t$stop[$c]\t$np[$c]\t$np[$c]
+\n";
            }
        elsif ($blocks[$a]=~m/^\d.+/ && $blocks[$b]=~m/^\d.+/)
        {
            if($np[$a] eq $flag || $np[$a] eq $flag)
            {
                print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$flag\n
+";
                print TRIPLET "$start[$b]\t$stop[$b]\t$np[$b]\t$flag\n
+";
            }
            else
            {    
                print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$np[$a]
+\n";
                print TRIPLET "$start[$b]\t$stop[$b]\t$np[$b]\t$np[$b]
+\n";
            }
        }
        else
        {
            print TRIPLET "$start[$a]\t$stop[$a]\t$np[$a]\t$np[$a]\n";
        }
                
                
                
        }
    else
    {
        print TRIPLET "$blocks[$index]\n";
    }
    
$index++;
$a=+2;
$b=+2;
$c=+2;
}
close BLOCKS;
close START;
close STOP;
close NP;
close TRIPLET;
exit;
[download]

the error that i get is syntax error at line 60 near "elsif" syntax error at line 81 near "else" syntax error at line 90 near "}" missing right curly or square brackets at the end

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