The algo for my R(a) is in the video thread by joshua, and the algo for R(b) is quite standardized. Only an idiot would use another algo for R(b).
To recognize, it's 2 'eyes', where 1 side of it is a block of 2.
Well, I am not sure whether it is because of what you are telling me the other day ("T"with broken side) or because of practice. I can do recognition faster lol.

Thanks J!!