I'd like to thank Les, Syzygy and Aristo for The Ghosts and Harpers: in this way I won't get bored waiting for the doctor & the dentist to go to work on me today & tomorrow (not to worry, nothing serious, I hope -- just painful)! In fact, I was always keen on "Ghosts" (don't find them "wrong" at all, which doesn't mean to say I can solve them easily!)
so this is a welcome new challenge! Thank you all!