Minimization of any expression of 4 variables through K-map, in which there are more chances of errors (like error in grouping) and the same expression with Quine-McCluskey Method there are less chance of errors but it should be of 4 variables. And I know that Quine-McCluskey Method gives accurate result as compare to K-map, when the number of variables exceed from 4 but what about 4 variables?