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Answers and rating deltas for

Why can't I concatenate items in this list but I can multiply them?

Author Votes Δ
Willem Van Onsem 11 +0.56
Attie 6 +1.82
omri_saadon 3 -0.37
MickaëlG 2 -2.76
Last visited: Aug 21, 2017, 10:48:17 AM