Given the recent advances in information technology. speed has become an important requirement in data transmission. In this regard and given that an LED (light emitting diode) can turn on and off for several thousands. even millions. https://www.roneverhart.com/Traditional-Karate-Do-Okinawa-Goju-Ryu-Book-1-The-Fundamental-Techniques-by-Morio-Higaonna-Preowned/