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Answers and rating deltas for

What is the use of ? and :

Author Votes Δ
ragatskynet 3 +4.26
Hkachhia 2 +2.52
Kerrek SB 2 +0.09
Codegiant 1 -0.37
Senthil Kumar 1 -0.47
Victor 0 -3.12
Prashant 0 -3.11
Last visited: Sep 14, 2014, 5:07:29 AM