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Answers and rating deltas for

What does the '?' character do in this operation?

Author Votes Δ
unxnut 5 +4.79
Steve 4 +0.53
Guffa 1 -0.40
OJay 0 -2.53
Ryan 0 -2.73
Last visited: Sep 14, 2014, 5:07:29 AM