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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_account_history(self, address, offset=None, count=None):
 """ Get the history of account transactions over a block range Returns a dict keyed by blocks, which map to lists of account state transitions """

        cur = self.db.cursor()
        return namedb_get_account_history(cur, address, offset=offset, count=count)