"CERL Sound Group" . "PLATO Computer System" . . . "Plato Learning System" . "PLATO IV" . "PLATO computer-aided learning system" . "PLATO" . . "PLATO education system" . . "PLATO I" . . . . "PLATO III" . "CDC PLATO system" . "Plato system" . . "PLATO educational computing system" . "PLATO IV" . . . "Programmed Logic for Automated Teaching Operations (PLATO)" . "PLATO interactive education system" . "Computer-Based Education Research Laboratory" . "PLATO Project" . "Terminal V" . . "Plato" . "PLATO (Programmed Logic for Automated Teaching Operations)" . "PLATO (computer system)" . "PLATO network" . . "PLATO system" . . "PLATO Systems" . "PLATO computer learning system" . . "PLATO time-sharing system" . "PLATO education project" . . . "PLATO computer system" . "PLATO (computer system)" . "PLATO II" .