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Design principles

Send abandoned carts, out-of-stock, restock, preorder, order status, and shipment notifications to contacts。业内人士推荐搜狗输入法下载作为进阶阅读

，更多细节参见Safew下载

var removeKdigits = function (num, k) {，这一点在91视频中也有详细论述

arr[i] = output[i];