public void TestNon2()
        {
            var sequence = new[] { 1, 2, 3, 4, 5, 6 };

            Assert.IsFalse(sequence.Non(i => i == 3));
        }
        public void TestNon1()
        {
            var sequence = new[] { 1, 2, 3, 4, 5, 6 };

            Assert.IsTrue(sequence.Non(i=>i == 10));
        }