What! A Stud? (In Search Of Studless Models - Part 4)

Isolating the available studs in a model requires that you analyse the whole column of bricks above any given stud - by analysing each layer in the column of your build matrix it's possible to isolate where the studs should be available - however my current code is not flawless - in the model below there are a couple of studs that are not identified (one above the base layer and one above the 1x2 wall texture brick).