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Answers and rating deltas for

How do I select all unique combinations of two columns in an R data frame?

Author Votes Δ
Shree 2 +1.04
tmfmnk 1 -0.08
Luis 1 +0.28
www 1 -0.52
tomasu 0 -3.81
Last visited: Sep 4, 2019, 3:46:46 PM