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Answers and rating deltas for

How do I check if all the elements in my array occur no more than twice?

Author Votes Δ
coreyward 5 +0.74
Wayne Conrad 5 +0.63
akuhn 5 +0.89
polyethylene 4 +2.57
vlasiak 1 -0.26
Cary Swoveland 1 +0.10
OneNeptune 1 -0.10
tadman 0 -1.27
Sagar Pandya 0 -0.79
Glyoko -1 -3.76
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