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Answers and rating deltas for

How can I check if a username already exists in a file and also add his points to him?

Author Votes Δ
Rizier123 3 +0.25
Adam Bieńkowski 0 -0.78
Santosh Jagtap 0 -0.68
Daniel Krom 0 -0.55
Last visited: Nov 17, 2015, 3:20:53 PM