Although there are many volumes returned, 200 volumes are conditional: only 50 denominations are sent, books, music, film and television education products are limited to more than 200, and only one volume can be used in a single order, which is valid within 30 days. Personal analysis is like this (buy 200 yuan's books, get 4 books, and you can only use up 4 books if you place an order in 200 yuan at least within one month). Unless you are sure to buy more books, buying them twice is equivalent to spending 400 yuan * * * and losing 50 yuan, which is not very cost-effective. So forget it! The above personal analysis, I don't know whether it is accurate or not, is for reference only.