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Array
(
    [first_item] => Array
        (
            [1] => 9
            [2] => 5
            [4] => 1
            [3] => 5
            [5] => 1
        )

    [second_item] => Array
        (
            [1] => 5
            [2] => 7
            [4] => 6
            [3] => 7
            [5] => 6
        )

    [third_item] => Array
        (
            [1] => 8
            [2] => 9
            [4] => 8
            [3] => 9
            [5] => 8
        )

    [fourth_item] => Array
        (
            [1] => 10
            [2] => 11
            [4] => 10
            [3] => 11
            [5] => 10
        )

)