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RTP Bulls and Cows

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Guess the computer's four digit number in the fewest possible moves. After each guess, the computer will give you Bulls (or black marks) that each signify a correct digit in the correct position, and Cows (or white marks) that each signify a correct digit but in the wrong position. Then switch roles with the computer!

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Its a nice game if you like code breaking...

Its okay. give it multiple functions and the choice between more than 4 digits.