In the rules for the Change of Mind (Purple), it states,
you may choose the colour of the dice to put away as well as the colour of the dice to take, but the colours must be different.
How does this work with multiple dice? The example is not helpful. Does this mean for each group of dice you pick one colour to change from and one other colour to change into, or does it mean that for each die you can pick the start and end colour?