Back and Forth Rows
Generate a string like abbcccddddeeeee
Count up then down
Given a matrix, swap the 2nd & 3rd columns
Sum the numbers on the main diagonal
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 - 3 keys
Decipher the number 3 - 10 keys
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