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Map all MacTighernans both genetically and geographically. If a MacTighernan does not know the original townland his family came from and matches another in the test that knows
his townland of origin then that could be a sure path in finding that family's unknown townland or parish and perhaps their common ancestor. In simpler terms, a rat hole with very high
assurance of results
Find the genetic link of the MacTighernans to either The O'Rorke or The O'Conor Don as was written in the Annals of the 4 Masters some 900 years ago