docs: protected static Iterable<TitanVertex> edges2Vertices(final Iterable<TitanEdge> edges, final TitanVertex other) {
          return Iterables.transform(edges, new Function<TitanEdge, TitanVertex>() {
              @Nullable
              @Override
              public TitanVertex apply(@Nullable TitanEdge titanEdge) {
                  return titanEdge.otherVertex(other);
              }
          });
      }