Merge many folders keeping most recent files?

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http://askubuntu.com – I have 102 directories that I would like to merge into a single directory. If there are conflicts I would like to use the most recent file. How can I do this? Previously I've tried searching for the folders then copying them into the same parent directory, since the directories I want to merge have the same name it asks if I want to merge them. However it doesn't have an option to automatically keep the most recent file. (HowTos)