Construction of Fares. When the fare between any two points is not specifically published via the desired routing, such fare shall be constructed by combining those fares, applicable via the desired routing from the Passenger's point of origin to point of destination, which produce the lowest fare for the class of service used; provided, however, that such fare will not exceed the lowest fare determined in accordance with paragraphs (1), (2), (3), and (4) of this Rule.