9. Suppose two tasks A and B must use the shared variable BuE_Size. Task A multiplies 2 to Buf_Size, and task B adds 1 to it. The initial value of Buf Size is 6. Assume that such arithmetic operations are done by the three-step process of fetching the current value, performing the arithmetic, and putting the new value back. In the absence of competition synchronization, show all possible sequences of events and the possibly different values that could result from these operations