!Name: Achim's p4 !Author: Achim Flammenkamp !Period 4 oscillator found in 1988. ..OO...OO .O..O.O..O .O.OO.OO.O OO.......OO ..O.O.O.O OO.......OO .O.OO.OO.O .O..O.O..O ..OO...OO