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void init_board(void);void delay_ms(long);void on_digit_zero(void);void on_digit_one(void);void on_digit_two(void);void on_digit_three(void);void on_digit_four(void);void on_digit_five(void);void on_digit_six(void);void on_digit_seven(void);void on_digit_eight(void);void on_digit_nine(void);void on_digit_dot(void);void clear_digit(void);void toggle_segment(int);void szamol(void);