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source_7b2599c35a134a15
{"contradictions": ["Two 1991 caffeine studies appear to disagree when bundled together: a 60-minute submaximal metabolism trial showed no measurable effect, while an elite distance runner time-to-exhaustion trial at the same approximate era showed longer run distance with caffeine. The receipts support treating this as a boundary-condition tension, not a contradiction on the same metric."], "limi…
sha256 428d73954d788ab1…