Sets all the curriculums in this meta curriculum to a specified
        lesson number.

        Args:
            lesson_num (int): The lesson number which all the curriculums will
                be set to.

def set_all_curriculums_to_lesson_num(self, lesson_num):
        """Sets all the curriculums in this meta curriculum to a specified
        lesson number.

        Args:
            lesson_num (int): The lesson number which all the curriculums will
                be set to.
        """
        for _, curriculum in self.brains_to_curriculums.items():
            curriculum.lesson_num = lesson_num