You could do something like this, but it is certainly no easier or clearer than two nested loops:
for my $keys ( map{ my $k=$_; map[ $k, $_ ],keys %{ $h{ $k}} } keys %
+h ) {
print "@$keys : ", $h{ $keys->[0] }{ $keys->[1] };
};;
a a7 : 7
a a9 : 9
a a8 : 8
a a3 : 3
a a10 : 10
a a2 : 2
a a4 : 4
a a5 : 5
a a6 : 6
a a1 : 1
b b6 : 6
b b7 : 7
b b4 : 4
b b8 : 8
b b9 : 9
b b3 : 3
b b10 : 10
b b1 : 1
b b2 : 2
b b5 : 5
...
If you need to process a variable depth structure, then you might look at Data::Rmap or Data::Diver, but you may find them unsatisfying difficult to use.
Every time I've tried to use the former, I've ended up reverting to a recursive subroutine tailored to my particular use.
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