pred.setSuccessorInMultimap(succ);
    succ.setPredecessorInMultimap(pred);
  }

  private static <K extends @Nullable Object, V extends @Nullable Object> void deleteFromValueSet(
      ValueSetLink<K, V> entry) {
    succeedsInValueSet(entry.getPredecessorInValueSet(), entry.getSuccessorInValueSet());
  }