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In page Decaffeination:
"Although a common technique of discarding a short (30 to 60 seconds) steep[8] is believed to much reduce caffeine content of a subsequent brew at the cost of some loss of flavor, research suggests that a five-minute steep yields up to 70% of the caffeine, and a second steep has one-third the caffeine of the first (about 23% of the total caffeine in the leaves).[9]
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