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Serge, thanks for pointing this out!
I've added these links (and I'm sorry for currently help contents is somewhat messy and not managed automatically).
By the way, the list of all existing wiki topics could be accessed with the secret link. Go to any page like this and remove the topic name from the url. (I do not post it for I do not want it to be indexed)
However there are some obsolete or never completed / used pages, sorry.