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What do you want to use them for?

I am not going to read 50+ lines of code just to find that out. If the key is a string array, why are you not able to save it in a variable?

But what is it? A number? A string? A complex object with several attributes?

What exactly is this "key" you are talking about? Perhaps you should create a class for that or an interface.

If you want to save something use a variable.