Perhaps in the sum, $ k $ indexes, and $ (4-k) $ is horizontal pairs per row, but only if rows are labeled k.

**Perhaps in the Sum, $ k Indexes, and $ (4-k) Is Horizontal Pairs Per Row—But Only If Rows Are Labeled k:

**Perhaps in the Sum, $ k Indexes, and $ (4-k) Is Horizontal Pairs Per Row—But Only If Rows Are Labeled k:
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