public void Test2()
        {
            var sol = new OddOccurrencesInArraySol();
            var n   = sol.Find(new int[] { 9, 3, 9, 3, 9, 7, 9 });

            Assert.That(n, Is.EqualTo(7));
        }
        public void Test1()
        {
            var sol = new OddOccurrencesInArraySol();
            var n   = sol.Find(new int[] { 4, 3, 4 });

            Assert.That(n, Is.EqualTo(3));
        }