Times 2 - START HERE
Select every other element of a vector
Encode Roman Numerals
construct matrix with identical rows
Cipher and Decipher the message - same key for all digits
Cipher or Decipher the number according to the second input - 3 keys - order [1 2 3 2 1 2 3 ......]
Rotate matrix by coloumns
Decipher the message - same key for all digits
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