In the program ThreadSync.java, three new threads have been created. thread1 prints out colons, thread2 prints out dashes, and thread3 prints out right parentheses. You are asked to add semaphores to synchronize these three threads such that the program will repeatedly print out one colon, followed by three dashes, then five right parentheses repeatedly, i.e., :---))))):---))))):---))))):---))))):---))))):---))))):---))))):---)))))… (Note the end of line was removed to save space.) You can add nothing but semaphore-related statements, i.e., declaring semaphores and calling acquire or release function on semaphores.