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    my %HoHoA = (
              'set1' => {
...
              # length of 2nd keys = 4 (all the same in 'set4')
);
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    set2  # Length 3
set3  # Length 3
set4  # Length 4
set1  # Length 7
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    foreach  my $set ( sort {#???}  keys %HoHoA )
{
    print "$set\n";
}