A relatively convenient method of electronic damping uses simultaneous multiphase energization, where more than one phase is energized simultaneously and some of the simultaneous phases are excited with a fraction of the normal operating (rated) voltage. A simultaneous two-phase energization technique has been suggested for a three-phase, single-stack stepper motor. If the standard sequence of switching of the phases for forward motion is given by 1-2-3-1, what is the corresponding simultaneous two-phase energization sequence?