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my @one_d = ( (1,2,3), (4,5,6), (7,8,9) );

my @two_d = ( [1,2,3], [4,5,6], [7,8,9] );

my $two_d = [ [1,2,3], [4,5,6], [7,8,9] ];

print Dumper \@AoH;

...
            'chapter' => 'Advanced'
          }
        ];