@Override
        public Traversal<Vertex, String> get_g_V_hasXname_GarciaX_inXsungByX_asXsongX_V_hasXname_Willie_DixonX_inXwrittenByX_whereXeqXsongXX_name() {
            return g.V().has("artist", "name", "Garcia").in("sungBy").as("song")
                    .V().has("artist", "name", "Willie_Dixon").in("writtenBy").where(P.eq("song")).values("name");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/GraphTest.java