that during which it takes place (the time) must be one and unintermittent, and that which is in motion must be one not in an accidental sense (i.e. it must be one as the white that blackens is one or Coriscus who walks is one, not in the accidental sense in which Coriscus and the white may be one), nor if it is done in common (for there might be a case of two men being restored to health at the same time in the same way, eg from inflammation of the eye, yet this motion is not one, but only specifically one).