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positive). This is a rank agreement. Pair 3: (B, C) Metric∆ = BLEU(B) — BLEU(C) = 0.70–0.75 = -0.05 Human∆ = 1 (B is ranked higher than C) Result: Metric∆ and Human∆ have different signs (metric is negative, human is positive). This is a rank disagreement. Plugging these into the formula we get: