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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 toc(self):
 """ Smart getter for Table of Content list. """

        toc = []
        stack = [toc]
        for entry in self.__toc:
            entry['sub'] = []
            while entry['level'] < len(stack):
                stack.pop()
            while entry['level'] > len(stack):
                stack.append(stack[-1][-1]['sub'])
            stack[-1].append(entry)
        return toc