| 12. The disc A coresponds to a 7-cycle, as seen by counting its spokes. |
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| In the same way, the disc B corresponds to a 9-cycle. |
| We cannot see the spokes of C, but instead we use the Farey sequence to conclude this disc corresponds to a 7 + 9 = 16-cycle. |
| Apply the Farey sequence again to conclude the disc D corresponds to a 7 + 16 = 23-cycle |
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