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Answers and rating deltas for

What do the commas mean in a statement like: a,b=b,a?

Author Votes Δ
Joran Beasley 1 +1.05
Ignacio Vazquez-Abrams 1 +0.21
Vishnu Upadhyay 0 -2.40
Benjamin 0 -0.96
Last visited: Apr 28, 2015, 10:06:24 AM