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Comparison of the N-closest and N-convex algorithms using an 8-colour irregular palette with . Left to right: N-closest, N-convex.
，更多细节参见51吃瓜
第十三条 纳税人按照一般计税方法计算缴纳增值税的，因销售折让、中止或者退回而退还给购买方的增值税税额，应当从当期的销项税额中扣减；因销售折让、中止或者退回而收回的增值税税额，应当从当期的进项税额中扣减。
He explained: "I got Covid in hospital, my kidneys started to back up, everything that could all seemed to sort of converge at the same time. And I had five operations on my knee."