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Ha ha! Watch this space, Jake - or not! :o)
I was talking to someone who firmly believes this works, which is what prompted my post, and I must admit I asked the question with tongue firmly in cheek just wondering if anyone would come up with some outlandish explanation to support it. If Wildwood hadn't instantly hit upon the very obvious fly in the ointment, I would have let it run a little longer. Incidentally, the reason I say I can never remember it coming up with the wrong result is because by the time the baby's born, I've forgotten what the result was!