encrypting documents and other files
The user will give a CNF in dimacs format.
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疾病的影响远不止身高。患儿常伴随中耳炎、脊柱侧弯、关节功能异常等并发症，严重的枕骨大孔狭窄甚至可能压迫脊髓、导致呼吸暂停，存在致命风险。
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The change to agar was a marked improvement. The jelly is so effective that it is still an invariable ingredient in what is known today as the “Koch’s plating technique” or the “culture plating method.” As Koch himself noted in 1909: “These new methods proved so helpful…that one could regard them as the keys for the further investigation of microorganisms…Discoveries fell into our laps like ripe fruits.”