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my @flat_data;

...
            || $a->[1] <=> $b->[1]
            || $a->[2] cmp $b->[2] }
       @flat_data;

Select or download this

my @flat_data;

...
            || $a->[1] <=> $b->[1]
            || $a->[2] cmp $b->[2] }
       @flat_data;