some questions on fare rules

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I have a few questions regarding fare rules. (If there is a better place for this post, please feel free to move it.)

The specific scenario that I’m looking at is a round-trip itinerary on a US-based carrier with two legs on the outbound journey and three legs on the return journey.

outbound: AAA -> BBB -> CCC
return: CCC -> BBB -> DDD -> AAA

AAA, BBB, and DDD are all cities in the continental US. CCC is in Central America.

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