Q$2.$ In a system there are three processes named $P,Q$ and R$.$ When the system starts, the process $P$ executes twice then process $Q$ executes once and after this process $R$ executes twice. The process $R$ cannot execute until process $Q$ has executed once and process $Q$ cannot execute until process $P$ has executed twice. The restriction mentioned above allows the process $P,Q$ and R to execute in following manner : PPQRR PPQRR PPQRR $..............$

Write the pseudo code for process P$,$ Q and R using counting semaphores. All the three processes access the critical section in mutually exclusive manner.