The Ogham key

With reference to the strange marks at Carn Enoch, here is a key for some (but not all) of the letters of the Ogham alphabet.  there are just 10 here  -- there were about 20 altogether, but the others were for the most part diagonal or angled marks, which appear to be missing here.  So can we use this key, and the simple sample below, to make sense of what we see on the rock surface?

Well, this is fun!