Array
(
    [a] => Audi
    [b] => BMW
    [n] => Nissan
    [r] => Renault
)

I like BMW.

Array
(
    [a] => Audi
    [b] => BMW
    [n] => Nissan
    [r] => Renault
    [v] => VW
)

Array
(
    [a] => Audi
    [b] => BMW
    [n] => Nissan
    [r] => Renault
    [v] => VW
    [0] => Tesla
)