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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_names_with_value_hash( self, value_hash ):
 """ Get the list of names with the given value hash, at the current block height. This excludes revoked names and expired names. Return None if there are no such names """

        cur = self.db.cursor()
        names = namedb_get_names_with_value_hash( cur, value_hash, self.lastblock )
        return names