Which values occur exactly three times?
radius of a spherical planet
Subtract two positive numbers
Sum the Digits of a Number
Mirror Image matrix across anti-diagonal
Cipher or decipher the number according to the second input - 10 keys
Decipher the number 4 - 3 keys - order [1 2 3 2 1 2 3 ......]
Decipher the message - 3 key
Cipher and Decipher the message - same key for all digits
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