code: def is_valid_transition(cls, from_value, to_value):
          
          try:
              return from_value == to_value or from_value in cls.transition_origins(to_value)
          except KeyError:
              return False
docs: Will check if to_value is a valid transition from from_value. Returns true if it is a valid transition.
          :param from_value: Start transition point
          :param to_value: End transition point
          :type from_value: int
          :type to_value: int
          :return: Success flag
          :rtype: bool