Mastermind (Bulls & cows)

"Mastermind" (or "Bulls and Cows" or "Codebreaker")  is a logical game where you need to guess the secret code.  The code is a sequence of colored chips, depending on the settings the secret code can contain 4, 5 or 6 chips. They can be repeated (no more than two chips of the same color for codes with 4 and 5 chips and no more than three chips in the same color for 6 chips codes.)  At each turn, …