A couple of weeks ago a colleague of mine raised a problem they encountered transforming some data to a required output format. The problem was to take a table of traveller itinerary information and produce a summary of the cities they included as a comma separated list. Although I couldn’t think of the solution right away the problem reminded me of similar things I had come across in the past. This problem has now been rattling around in my head for long enough so this afternoon with a little ANZAC Day spirit I sat down to conquer it.

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