Niels van Ham wrote on Fri, Jan 19, 2024 08:06 AM UTC:
I actually liked the wikipedia version of it more, with t[FR] for the Griffon, F then R. And other symbols/compunds within [] changing their meaning, like [cr], [ca] and [cw] for rifle, approach and withdraw capture respectively. But this page does note other things like X, k, y and U