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Here is how I would approach this: First off, strip off the unkeyed parts of the cipher at the beginning and the end. That is, process the plaintexts with the 'rotr 8/add/rotl 3' at the beginning, and process the ciphertexts with the 'xor/rotr 3' at the end (rotr because we're working the inverse direction). Next, we focus in on only the right side ...

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