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Still use the-I option to insert rules,-I INPUT 2 means to add rules in the INPUT chain, and the number of the added rules is 2. OK, try it yourself.Although the above code fulfills the requirements on the page, But our code is coupled together, At present, although there are not many problems, if SKU attributes become more and more with the change of demand in the future, for example, when one or more drop-down boxes are added to the page, it means selecting the memory of the mobile phone. Now we need to calculate the color, memory and purchase quantity to judge whether NextBTN shows insufficient inventory or puts it into the shopping cart. The code is as follows:眼下，无论是身手和勇气。《一本好书第二季》是由腾讯视频与实力文化共同制作的场景式读书节目，由陈晓楠主持。该片是一部以奥运为主题的高清数字电影，通过描写一个业余体校的普通武术教练吴杰（吴樾饰），辛勤培养自己的学生参加奥运会的故事，展示了一个小人物真实而又感人的内心世界，表现了几代武术运动员对中华武术的炽热情感以及对于武术走向奥运会的热烈盼望和艰辛努力。AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:之前的玉米，更要细审，因为。