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www.impquiz.co.uk
That should get you there. It's a local Lincolnshire quiz, but the questions cover all sorts of questions. The one I'm doing at the moment is 'School Time', and the one after is 'All Things Bright & Beautiful.' The quizzes can be downloaded, and I just send my �1 off with my answer sheet..
I've got a little electronic dictionary encyclopedia gadget . When I typed in Stemma it came up with your family tree idea, so I'm going with that after all, as that was the first definition given for stemma.