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foreach $key_1 (keys %hash_1) {
   foreach $key_2 (keys %hash_2) {
...
$vars = {
   my_hash= > \%my_hash
}

[% FOREACH key_1 IN my_hash.keys.sort.reverse %]
   [% FOREACH key_2 IN my_hash.$key_1.keys.sort.reverse %]
      output something
   [%END%]
[%END%]

[% FOREACH key_1 IN my_hash.keys.sort %]
   [% FOREACH key_2 IN my_hash.$key_1.keys.sort %]
      output something
   [%END%]
[%END%]

[% IF sort_order == 1 %]
   [% FOREACH key_1 IN my_hash.keys.sort %]
...
      [%END%]
   [%END%]
[%END%]

[% FOREACH key_1 IN my_hash.keys.variable_sort_order %]
   [% FOREACH key_2 IN my_hash.$key_1.keys.variable_sort_order %]
      output something
   [%END%]
[%END%]