You can create a HoA just like you create an AoA. If the As in the HoA happen to be AoAs, that's just fine and dandy. You'll end up with a HoAoA.

Keep in mind that you can't store an array into a hash anymore than you can store an array into an array. You can only store a reference to an array.

my %HoAoA = (
   foo => [ [ 1,2 ], [3,4] ],
   bar => [ [ 5,6 ], [7,8] ],
);

use Data::Dumper;
print Dumper \%HoAoA;
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