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　　一个伤心的城市，到底隐藏了多少秘密在其中呢？想着自己的前途暗无天日，黄豆十分悲愤。Add a method called set_number_served (), which allows you to set the number of people to eat. Call this method and pass a value to it, then print the value again.Since you use the-R option to modify a rule, You must specify the matching criteria for the original rule, Then we can understand that, The action corresponding to the rule can only be modified through the-R option, So I think if you want to modify a rule, it is better to delete the rule first and then insert a new rule in the same position. Of course, if you only want to modify the action of a rule, don't forget to specify the matching conditions corresponding to the rule when using the-R option.沈悯芮话罢，又从杨长帆手中抢过了茶具，转身而去，不给人任何商量的余地。花王，皮特，孙和莫克的故事的延续。The code is not difficult to understand. The down event and the 3rd and 5th events (counting from 0) in the MyView consumption event sequence are implemented, and other events are not consumed. At the same time, for convenience of viewing, the value of X is printed out in the log. The log is as follows (the log for each event is separated by empty lines):