We are of course all very grateful for the contributions from Clair our Moderator. However, Clair regularly posts links to complicated and obsure French sites, when there equally good, if not better, reference sites in English. This is the case here, where I can think of a number of sites (IFP, FE etc) where there is a lot of useful information on this subject. Come on Clair, if you are being told to keep other Anglophone sites off the LF pages, we do think you ought to come clean about it. I wonder if this post will be published? If not, I think it proves my point.