Here's a question for the experts:

Is this type of itinerary combination OK using the same carrier?

(Example)

Itinerary 1

Day 1: A-B-C-D-E-F (arrive Day 2)
Day 13: F-D-C-A

Itinerary 2

Day 2: F-A-G-H-B
Day 12: B-C-J-A-K-F (arrive Day 13)

where

These are intercontinental itineraries. Point F is outside the USA and all other points are in the USA. There are no stopovers.

Saturdays are say Days 3 and 10.

Both itineraries require a Saturday night stay, otherwise no minimum stay.
Fare rules do not allow double open jaws. Half round trips may be combined in many cases. Itinerary 1 allows end-on-end, and Itinerary 2 allows end-on-end for domestic fares without specifically disallowing for international.

Thoughts?