File: output.txt

Array
(
    [0] => Array
        (
            [0] => 5
            [1] => 1
            [2] => 8
            [3] => 1
        )

    [1] => Array
        (
            [0] => 4
            [1] => 3
            [2] => 3
            [3] => 5
        )

    [2] => Array
        (
            [0] => 6
            [1] => 3
            [2] => 5
            [3] => 0.5
            [4] => 0.1
        )

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

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

    [5] => Array
        (
            [0] => 5
            [1] => 4
            [2] => 4
        )

)