use strict;

# Global data structures
use vars qw(@foo @bar);

@bar = qw(Topology IPClassA subnet_address Topology IPClassA Device=1
          log_ratio Topology IPClassA Device=1 Port=1 poll_interval Topology 
          IPClassC security_string Topology IPClassC Device=2 Port=2 
          poll_interval);

my $i = 0;
my $j = 1;

print "Foo Before:\n\n";
foreach $_ (@bar){
    print "$_\n";}

push @foo, "Topology";
    foreach $_ (@bar)
    {
        if ($bar[$i] eq $bar[$j])
        {
            $i ++;
	    $j ++;
	}
	else
	{
	    push @foo, $bar[$j];
	    $i  = 0;
	    $j ++;
	}
    }
	    print "\nFoo After:\n\n";
	    foreach $_ (@foo){
	        print "$_\n";}