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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 get_statistics(self):
 """Get all statistics as a dictionary. Returns ------- statistics : Dict[str, List] """

        return {
            'cumulative_elapsed_time': self.get_cumulative_elapsed_time(),
            'percentage': self.get_percentage(),
            'n_splits': self.get_n_splits(),
            'mean_per_split': self.get_mean_per_split(),
        }