Anyone you have put into a group or messaged will stay as it is now. Those you haven't sorted or messaged will disappear.
I've gone thrulines and grouped anyone there. I've also grouped common ancestors, people whose trees have births in places I'm interested in and also surnames I'm interested in, assuming the tree has over 100 people.
I feel I will lose a heap of matches but just can't go through them all knowing I wont be able to work out most of them anyway.
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Toni 
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