public void PartB_Actual()
        {
            var sut    = new DayFour();
            var result = sut.PartB();

            Assert.Equal("78990", result);
        }
        public void testNumberValidPassPhrases_PartB()
        {
            var sut    = new DayFour();
            var result = sut.PartB();

            Assert.Equal("167", result);
        }