@Override
        public Traversal<Vertex, String> get_g_V_order_byXname_a1_b1X_byXname_b2_a2X_name() {
            return g.V().order().
                    <String>by("name", (a, b) -> a.substring(1, 2).compareTo(b.substring(1, 2))).
                    <String>by("name", (a, b) -> b.substring(2, 3).compareTo(a.substring(2, 3))).values("name");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/OrderTest.java