Google Flights allows a search across a long period time to find the cheapest fare for O/W trips or R/T trips with a given length of stay, by using the graph search feature. Is there any way to do a similar search for multi-city trips? Maybe there are just too many permutations to allow that. For example, it's easy to find the cheapest biz class fare for (say) ORD-FCO-ORD. But could you do the same thing for (say) ORD-FCO, VCE-ORD?
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