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Openai/6955e0f9-71f0-8005-b29b-45f8f5be7e41
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==== 你要的應該是這種結構: ==== * 一條序列有 7 個 step * Step1 固定是「abc」(三因子同時存在) * Step2–Step7 每一步可以是 a/b/c(或你要的其他規則) * 你之前也一直在強調「排除缺少 a/b/c 其中之一」——但如果 step1 已經是 abc,那條件自動滿足了(後面怎麼排都不會缺 abc)
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