I'd like to calculate the Eint for corrosion inhibitors on Fe surface and already got the script of Eint for XTD by forcite from the official website, but it's only used for two systems. Here I need three systems to do it, I think, maybe A, B, and C. It means I need to define another system. It should be simple, but I don't know how to do it. Is there anybody who could help me? Appreciate!!