Since my original posting I added some outer code to what is presented above. Its purpose was to run the sheet 10000 times but limit the 3 selections to just 6 possible choices. I don't believe that I need to present that code as I am confident that, after 10000 tests across such a small "population", it works.

I just want explanations for where I had doubts. "Why is it so?", to quote Julius Sumner Miller.