public void RadioAndTv_ShouldStartWithKorW()
        {
            // Arrange
            var elementPredicate = new[] { 'K', 'W' };

            // Act
            var radio = _sut.Radio();
            var tv    = _sut.Tv();

            // Assert
            Assert.IsNotNullOrEmpty(radio);
            Assert.IsNotNullOrEmpty(tv);
            radio[0].ShouldBeOneOf(elementPredicate);
            tv[0].ShouldBeOneOf(elementPredicate);
        }