I got 3100, but I had to think about it. It's the number of 0's that screws people up, I think. You've got 1000 then 1000-something, then 2000-something, then 3000-something, so you'd expect it to go to 4000.
Ok, maybe that makes more sense in my head than it does written out. Lol
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On the heart of each sister
lies one 0-----,, that binds us