Two circular discs have radii 8 and 28. The larger disc is fixed, while the smaller disc rolls around the outside of the larger disc. In their original positions, point \(A\) on the smaller disc co-incides with the point \(B\) on the larger disc. The least number of rotations that the small disc makes about its centre before \(A\) and \(B\) again co-incide is:

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