4: Rafiq has 4 parking spaces in the basement of his apartment. Now, he wants to know when two adjacent space are open as he doesn't not want anyone to park next to his brand-new car. Rafiq already set up a pressure switches in the parking space to detect if the space is occupied or not and also has 4 logic indicators outside his building. He wants one logic indicator to activate if two adjacent space become open, another logic indicator to active if three space become open, a third if all spaces are open and a fourth if one space is open (in case he chooses to risk it).