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Answers and rating deltas for

How can I check whether only one out of three variables is not empty?

Author Votes Δ
Haresh Vidja 31 +1.33
Dominique Lorre 25 +3.49
Hanky Panky 10 -0.13
Fabio Poloni 7 +0.11
SanketR 5 -0.15
Martijn 3 -0.83
Mirror318 3 -1.80
Dave 1 -3.63
Last visited: Dec 13, 2016, 2:03:55 PM