420.1.a. Swapping creates two different effects that apply to each attribute. One that Increases one value and one that Decreases the other.
420.1.b. To accomplish this, determine the difference between these values and then apply an Increase for that amount to the lower value of the two attributes, and a Decrease of that amount to the higher value of the two attributes.
420.1.c. If both attributes are the same numeric value, Swapping has no effect.