A<br>B<br>D<br><br><pre>Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [0] => A
                )

            [1] => Array
                (
                    [0] => B
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [0] => C
                )

            [1] => Array
                (
                    [0] => D
                )

        )

)
</pre>