Hello , Have been out of school (and work ) for a while. Was working on something I never got to finish from McGraw hill PlC workbook and have not figured out this simple? logic. Here is the question for designing a three led light system. Sure someone has seen it , I just did not find the answer and professor was frustrated at having to explain at the time. > 1)three leds are to be all turned on (l1 , l2 , l3 ) by sw 1 2) two leds off l1 and l2 , led l3 is left on. by sw 2 3) one led l1 is turn back on , l2 is off and l3 on now. by sw 3 4) all remaining leds are turned off. by sw4 Probably so many ways to do it, just something I missed about it? thanks . finally got reset password.