public static OutSelector <T> Out <T>(this Selector selector)
        {
            var outSelector = new OutSelector <T>(selector.Client)
            {
                ParentSelector = selector
            };

            return(outSelector);
        }
        public static OutSelector <T> Out <T>(this Selector selector, string edgeLabel = null)
        {
            var outSelector = new OutSelector <T>(selector.Client, edgeLabel)
            {
                ParentSelector = selector
            };

            return(outSelector);
        }