Are you actually adding the array multiple times, or exponentially really? However, I can't get that piece of code to work (Run-time error 13, Type mismatch). It looks like adding two arrays is possible, what does that last comma do in this line and would you be able to explain a little bit how that works?
I had a look at your homepage and believe I will learn a lot from it, thanks![snb_001]=[index(snb_001+snb_001,)]