cor there is something odd there will see tks re the diagram actually i probably have a version with those extra arrows as well but in theory since one could go every which way forward through the steps i dropped them in favour of the 'nominal' class by slass route the coloured 'stream' backgrounds at least show that a is the next step purely in milhist terms after b and fa comes after ga in wp wide grades plus i have the disclaimer in text just before the diagram that this is not the only route through the classes whew rationalisation complete cheers