How to find the unique elements in multiple strings?

I have strings like the below. It can be 1 or can be more than 20. Here is an example with just 2 strings>

A = "CTDTMP, CTDSAL, CTDOXY, Silicate, Phosphate";
B = "CTDTMP, CTDSAL, CTDOXY, Ammonium";

How do I generat C as the below?

C = "CTDTMP, CTDSAL, CTDOXY, Silicate, Phosphate, Ammonium"

Thanks!

Answer 1

[Akihumi]

unique([strsplit(A,', '), strsplit(B,', ')])