public void Test2B()
        {
            string a = "<random characters>";

            Assert.AreEqual(17, Dec9.CountCancelled(a));
        }
        public void Test2G()
        {
            string a = "<{o\"i!a,<{i<a>";

            Assert.AreEqual(10, Dec9.CountCancelled(a));
        }
        public void Test2A()
        {
            string a = "<>";

            Assert.AreEqual(0, Dec9.CountCancelled(a));
        }
        public void Test2D()
        {
            string a = "<{!>}>";

            Assert.AreEqual(2, Dec9.CountCancelled(a));
        }