Array
(
    [0] => Array
        (
            [0] => abc
            [1] => ABC
        )
[1] => Array
        (
            [0] => ab
            [1] => AB
        )
[2] => Array
        (
            [0] => a
            [1] => A
        )
[3] => Array
        (
            [0] => c
            [1] => C
        )
)