public default GraphTraversal<S, E> except(final Collection<E> exceptionCollection) {
return this.addStep(new ExceptStep<>(this, exceptionCollection));
}
public default <E2> GraphTraversal<S, Map<String, E2>> where(final String firstKey, final String secondKey, final BiPredicate predicate) {
return this.addStep(new WhereStep(this, firstKey, secondKey, predicate));
}