Question: The ciphertext string ASISENGEHFGNONFVWTGNQWCVSE was produced using a shift cipher over the 2 7 - letter alphabet A = 0 , B = 1 ,

The ciphertext string
ASISENGEHFGNONFVWTGNQWCVSE
was produced using a shift cipher over the 27-letter alphabet
A =0, B =1,..., Z =25,=26,
where the final character indicates a space.
By conducting a frequency analysis of a larger sample of ciphertexts, it has been
found that the plaintext symbol E corresponds to the ciphertext symbol S. Determine
the first word of the plaintext string corresponding to the ciphertext string given
above.

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