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Answers and rating deltas for

How do I only add an entry to a List<> when it's not already in the list?

Author Votes Δ
Bad Dub 1 +3.93
igventurelli 0 -1.38
Max Venediktov 0 -1.38
Black Frog 0 -0.15
Last visited: Jun 24, 2017, 4:03:14 PM