1 2
3 4
5 6

##</code><code>##

1 4
2 5
3 6

##</code><code>##

my @keys = sort { $hash{$b} <=> $hash{$a} || $b cmp $a } keys %hash;

my $half = int($#keys / 2);

printf "%s => %s\t%s => %s\n",
   $keys[$_      ], $hash{$keys[$_      ]},
   $keys[$_+$half], $hash{$keys[$_+$half]}
      for 0 .. $half-1;

printf "%s => %s\n",
   $keys[$#keys], $hash{$keys[$#keys]}
       unless $#keys % 2;