Response to the author's commentary "How many combinations?..." The amount of combinations is surprisingly simple to compute. given the equation: x*y where x is equal to the amount of options that you can choose (AKA the number of Cipher Plates) and y is equal to the amount of slots that you have (AKA how many things you can use at one time).
thus we get 7*2 (the amount of plates+the fact that we don't need to put a plate in.)*(the amount of plates we can use at once) or 14 different combinations.
This equation can also be used in any case were the order of the chooses mater and each choice can only be used once.