Reindex a vector
Insert zeros into vector
Decipher the number 4 - 3 keys - order [1 2 3 2 1 2 3 ......]
Decipher the number 2 - 3 keys
Decipher the message - same key for all digits
Cipher or Decipher the number according to the second input - 1 key for all digits
Decipher the message - 3 key
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