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On GEDMATCH, I have three matches with which I share (respectively) 15/23/36 cM on the X and they share with each other 39/40/51. Using the "People who match one or both" function, I have compared the four of us on the X chromosome and we all overlap at 93242736 - 111585096. I already know these three individuals are related (3rd cousins and 4th cousins once removed). Does this mean we all likely got this matching X segment from a common ancestor?