Array
(
    [0] => -20
    [1] => -10
    [2] => 0
    [3] => 10
    [4] => 20
    [5] => 30
    [6] => 40
)

Array
(
    [0] => -2
    [1] => 16
    [2] => 34
    [3] => 52
    [4] => 70
    [5] => 88
    [6] => 106
)