consider a computer program that simulates the construction of a bridge, with sequential steps involving building piers, constructing the bridge deck, and finally connecting the road. Assume there are three pier construction processes from left to right, named P1,P2,and P3. P4 represents the bridge deck construction process between P1 and P2, while P5 represents the bridge deck construction process between P2 and P3. The final steps involve connecting pier P1 to the road (P6) and connecting Pier 3 to the road (P7). Implement a program using semaphores to control the execution of these processes using pseudo code.