Is it possible to have two strings in a dictionary?

local Cost = { ["Dropper"] = {Cost = 1, Currency = "Cash"} }

I want to be able to buy items, structures and other things with more than one currency.

Is there a way to add 2 or more strings the Currency so it looks something like:

--Text below in this block work just an example of how I thought it would look.--

Currency = "Cash","Wood","Stone"

--Text below in this block work just an example of how I thought it would look.--

However the way I show below is messy and it doesn't seem efficient. It works bust just looking for a better solution.

local Cost = { ["Dropper"] = {Cost = 1, Currency = "Cash", Currency1 = "Wood", Currency2 = "Stone"} }

Thanks! - Lost Phantom