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I have tried with some lengths but it worked so that the product was Vigenère with length of LCM. Actually, the statement really isn't "is encrypting with cipher $\mathcal{V}_1$ and the cipher $\mathcal{V}_2$ always equivalent to some cipher $\mathcal{V}_3$. Instead, it's "are the set of transforms that you can express by first encrypting by some ...

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