class SpecifiersReachabilityAnswerer extends Answerer {

  @Override
  public AnswerElement answerDiff(NetworkSnapshot snapshot, NetworkSnapshot reference) {
    throw new IllegalArgumentException(
        "This question should not be run in differential mode. Instead, consider: "
            + StringUtils.join(DIFFERENTIAL_ALTERNATIVES, ", "));
  }

  public  SpecifiersReachabilityAnswerer(Question question, IBatfish batfish);

}