Oh sorry. I forgot to say that I use SwiftUI. And The problem is both to create the display and and the code to put letters.

wow this is a lot. thank u so much. it most have taken you some time to write all this. really appreciate it :)

i don't think I know what @StateObject is unless its the same as @State var. and I acutely don't use core data for this project, mostly because I don't know how, but now I have something to keep me going for a while(: