Page:Organum mathematicum libris IX. explicatum (1668).djvu/951
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aptissime praestari poste per unam aliquam litteram in ipsa scriptione usitatam, certis intervallis solum, nec alibi in Epistolae contextu repetita, quae unica omnium omnino litterarum in secreto, quod amico significandum est, occurrentium veces et valorem obtineat; cujus praxin mox subnetam.
&. II
Requisita ad Cryptographiam novam.
