public void Problem4Example() {
            // Arrange
            var problem = new Problem4();

            // Act
            var result = problem.LargestPalinedromeFromTwoNumbers(2);

            // Assert
            Assert.AreEqual(9009, result);
        }
        public void Problem4Answer() {
            // Arrange
            var problem = new Problem4();

            // Act
            var result = problem.Answer;

            // Assert
            Assert.AreEqual("906609", result);
        }