Image:AD-cycle.png
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Date/Time | Dimensions | User | Comment | |
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current | 14:21, 13 December 2005 | 800×689 (25 KB) | Matt Crypto | (A 4-cycle formed from the first and fourth letters of four Enigma message indicators, as used before 1938 by the German military. ~~~~ {{PD-user|Matt Crypto}}) |