Suppose you have a language with only the 3 letters a, b, c, and they occur with frequencies .7,

.2, .1, respectively. The following two ciphertexts were encrypted by the shift method (shifts

are mod 3 instead of mod 26, of course):

(a) ACABA

(b) BBBBC

Determine the most probable plaintext in each case using the dot product method. Show your