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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 record_prefix(required_type, factory):
 """ Creates a record prefix for the specified record type. :param required_type: the type of the record using this prefix :param factory: field factory :return: the record prefix """

    field = record_type(required_type)
    field += factory.get_rule('transaction_sequence_n')
    field += factory.get_rule('record_sequence_n')

    # field.leaveWhitespace()

    return field