code: def set_all_curriculums_to_lesson_num(self, lesson_num):
          
          for _, curriculum in self.brains_to_curriculums.items():
              curriculum.lesson_num = lesson_num
docs: 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.