I'm trying to do a project about email marketing. I'm working on a tourism company and I want to make a best destination suggestion for the clients. But I need to see the relations between destinations.
Example: How many people visited Dublin and then visited London?
My question: How can I best analyse this relation between the cities, given data about traveler itineraries?
I want to send email offers to clients who went to London and didn't go to Dublin (assuming a strong relation between London and Dublin).