How to get the value of every incrementation in the list combined? : Given the list of `[0, 10, 20, 5, 10, 30, 20, 35]`, how do I get the list of `[20, 25, 15]` for every incrementation of the values in the initial list? `[0, 10, 20]` turns into `[20]`, `[5, 10, 30]` turns into `[25]`, and `[20, 35]` turns into `[15]`.