^Stamp a number on each keyword - preferably the number matching the required order of the keys - and you won't have to worry.
I want to do this - just because it's so cool!
What about dealing with a "losing one" scenario that STRF had mentioned?
You suggesting that "cool" people do not have the right
(if that's an appropriate word choice?) to lose any of those 12, 18 or 24 washers?
But what happens if you lose 1 or the order of them?
You add the index number, possibly obfuscated (reversed order, as a simpler example)
get creative

Same question to you OOM (ditto) - as I had raised above for homerx
(except substitute "creative" for "cool").
I think I've figured it out if you mix the order of them.

... Basically you make 1, 2 and 3 dents in each of them. And then you put them in a specific order based on the dent.
For example : 3 > 2 > 1 < 2 < 3 > 2 > 1 > 2 > 3 (considering you have just 9 pieces). And then if u mix the 2 / 3 or 1... u can just mix them till u find perfect combination. Or you can put them in another order of your liking.
