‘The ancient literature is quite clear, though little studied, I fear. It gathers dust rather than readers. Writings collected in the earliest years of the Tower make it plain that circles were not limited to thirteen, in the Age of Legends. The precise mechanism – I should say, the precise balance – is unknown, but it should not be too difficult to work out. For those of you who have not spent the time you should have in the Tower library, the manner of increasing the size of a circle involves . . . ’ For the first time, she faltered, and visibly forced herself to continue. ‘ . . . involves
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