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1 = 1
2 = 2
3 = 3
4 = 4
5 = 5

1 = 2
2 = 2
...
4 = 7
5 = 5
6 = 6

use strict;
use warnings;
...
    for my $key (sort {$a<=>$b} keys %seen){
        #don't know how ,where to get valueat [0],value at[1] from??wh
+o has the values? what is really (a and b) in, is it $_ or %seen? wha
+t am I really evaluating with,is it like this: $seen{$key}[0]=$a or $
+seen{$key}[1]=$b...completely lost...
        }