4. Suppose that a cryptanalyst suspects that the cipher text:

KNCFNNW OARNWMB CQNAN RB WX WNNM XO SDBCRLN

was produced by applying a shift encipherment of some unknown number of letters and then applying a second shift encipherment (by a different number of letters) to that. How will the work to obtain the plaintext in this case compare with the work to find it if the cryptanalyst suspected a single shift encipherment? Decipher the message.