‘Have you been listening or haven’t you? Didn’t I just say that so far no one has answered that question? Of course, I’ve worked up a few theories over the years. At first I thought the sphinxes’ judgment might be guided by certain physical characteristics – size, beauty, strength, and so on. But I soon had to drop that idea. Then I toyed with numerical patterns. The idea, for instance, that three out of five were regularly excluded, or that only prime-numbered candidates were admitted. That worked pretty well for the past, but for forecasting it was no use at all. Since then I’ve come to the
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