Famous Mystic Ball, which predicts the future and helps in completing complex ideas, is now in the hands of players. Come up a question, shake the ball and get a response. Of course, this is only a funny way to predict the future - there are no any guarantees about true answers for the questions! Furthermore, you should respect the etiquette - the ball can not answer the same question twice! A formulation of the question must comply with the answers "yes, no, and I do not know" - do not ask your