A lock can be opened using the correct combination of 4 digits in the correct order. When 5638 is tried, three are wrong (digits or order). When 3628 is tried, two are wrong (digits or order). When 3147 is tried, two are wrong (digits or order). When 5629 is tried, two are wrong (digits or order). When 1528 is tried, all four are wrong (digits or order). The correct combination is