Matrix indexing with two vectors of indices
Multiply 2 numbers
Add two numbers
select the primes of a vector
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 ......]
Cipher or Decipher the number according to the second input - 1 key for all digits
find the index of local maximum in matrix
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