So, lets say we have 10 boxes and we dont know what is inside
we can put them in a pile in 1, 2 or 3 category
depending on where we put the box, we assigned it something to have inside

category 2 is split into 3 but it doesnt matter cause its essentially the same thing
so i wanna know, how many combinations can exist?

how many combinations you can make with these parameters?
as i understand it, you have theoretically 30 boxes to arrange however you want or am i missing something cause category 2 is split in 3?