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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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