my @fastarray;
my %matches;
my %sets;
my $span;

for my $element (@fastarray) {
    my $setscounter = 0;

    next unless defined %{$matches{$element}};

    for my $site (sort {$a <=> $b } keys %{$matches{$element}}) {
        next unless @{$matches{$element}{$site}};

        for my $low (@{$matches{$element}{$site}}) {
            my $lowerlimit = $low + 0;
            my $upperlimit = $span + $lowerlimit;
            
            for my $sitekey (sort {$a <=> $b } keys %{$matches{$element}}) {
                next unless @{$matches{$element}{$sitekey}};
                
                my @arrayA = ();
                
                for my $hElem (@{$matches{$element}{$sitekey}}) {
                    print "...in \$hElem\n";
                    if ($hElem >= $lowerlimit && $hElem <= $upperlimit) {
                        push (@arrayA, $hElem);
                    }
                }
                
                if (@arrayA) {
                    $sets{$element}[$setscounter]{$sitekey} = \@arrayA;
                    print "\$sets{$element}[$setscounter] is:\n";
                    print Dumper(%{$sets{$element}[$setscounter]});
                    @arrayA = ();
                } else {
                    $sets{$element}[$setscounter]{$sitekey} = undef;
                }
            }
            
            $setscounter++;
        }
    }
}