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

            [2] => Array
                (
                    [0] => 1
                    [1] => 2
                )

            [4] => Array
                (
                    [0] => 2
                    [1] => 1
                )

        )

    [1] => Array
        (
            [1] => Array
                (
                    [0] => 8
                    [1] => 7
                )

            [3] => Array
                (
                    [0] => 7
                    [1] => 8
                )

            [5] => Array
                (
                    [0] => 8
                    [1] => 9
                )

        )

)