How many four-color codes can be made if the colors cannot be repeated? And since these are codes, we're going to assume that blue, red, yellow, and green is different than green, red, yellow, and blue. We're going to assume that these are not the same code. Even though we've picked the same four colors, we're going to assume that these are two different codes. And that makes sense because we're dealing with codes. These are different codes. This would count as two different codes right here, even though we've picked the same actual colors, the same four colors.