I am so sorry to have been the source of a headache for you!!
I assure you it all came from the same block I pictured. However, I had a bunch of the blocks sliced up, so it is possible I am mixing them, but I have lots of them together and don't seem to have any extras.
You are NOT dumb.... it is hard for me to visualize this kind of thing too! As I am putting the next bunch together, I will try to figure out how to explain the way I do it.