Question: Suppose that the most common letter and the second most common letter in a long ciphertext produced by encrypting a plaintext using an affine cipher

Suppose that the most common letter and the second most common letter in a long ciphertext produced by encrypting a plaintext using an affine cipher f (p) = (ap + b) mod 26 are Z and J, respectively. What are the most likely values of a and b?

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