Hand-Coded Weights (Constructive Proofs)
* 进阶：使用Sedgewick步长序列（更高效）
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Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
Minifying and combining JavaScript and CSS files