mastermind :: IO ()
O programa deve começar por gerar uma sequência secreta de 4 dígitos aleatórios que o jogador vai tentar descodificar.
Sempre que o jogador introduz uma sequência de 4 dígitos, o programa responde com o número de dígitos com o valor correto na posição correta e com o número de dígitos com o valor correto na posição errada.
O jogo termina quando o jogador acertar na sequência de dígitos secreta.
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