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Answers and rating deltas for

What does the "?" mean in the following statement

Author Votes Δ
Rudi Visser 12 +4.01
Nyx0uf 4 +2.44
Femaref 4 +0.25
ryanprayogo 3 +1.15
AliHA 3 +1.08
VonDequen 2 -1.22
Viktor Stolbin 2 -1.18
Chance 1 -3.16
Nikita Leonov 1 -3.45
Last visited: Sep 14, 2014, 5:07:29 AM