Very few routes indeed. I don't really know why FR does not seem to like W-patterns, preferring to have small bases all around (in some cases too much of them, I'd say) and flying two-ways only. While the W-patterns are not bad at all, even better could be a "delta"/triangle flight pattern. Why delta? The aircraft from the base A (anything) goes to non-base destination X (like BVA) and then to Y (like Venice) and thereafter returns directly to the base. Flying these triangle patterns does create much more variations. For example A-X-Y-A in the morning and A-Y-X-A in the evening on even weekdays and in reverse mode (A-Y-X-A mornings, A-X-Y-A evenings) on odd weekdays. Try to analyze a bit, this theoretical model gives numerous day-trip possibilities where W-patterns or simple return flights do not have this flexibility.