Jack: As you are constantly referring people to these rules, I don't think it too much of a drift to query one of the forbiddens. What is the use of a discussion forum, pray, on which one may not be 'argumentative'. Argument is surely the lifeblood, the ichor, the sine qua non of such a forum as this?

& if I have ever known what "that of-what*-we-do-not-speak" was, I have forgotten. Would it be a banned action for some kind, and authorised, person to remind me — perhaps by PM if not openly on the forum?

~M~

*And with my hat on of Official Legendary Pedant, as someone once called me in a post, might I merely observe in passing that "that-of-which-&c" would be seemlier idiomatically and grammatically than "that-of-what-..."?