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In reality, we often encounter multi-classification learning tasks. Some two-classification learning methods can be directly extended to multi-classification, but in more cases, we use two-classification learners to solve multi-classification problems based on some basic strategies. Therefore, the fundamental method of multi-classification problem is still the two-classification problem.此战他瞅的时机很好，可谓是进可攻，退可守，立于不败之地啊。李翰祥执导的《佛跳墙》共有四个单元，首个故事是描述一对母子因施予济公一碗豆浆而逃过丧命之危；其二则说济公帮助卖菜汉，逃离高利贷者的滋扰；其三则写济公以樱桃化夜明珠，将大盗教训一顿；最末一则是描写济公以巧计捉弄胡作非为的相爷父子。李翰祥借济公的善行，针贬权贵恶霸的种种恶行，为平民大众吐一口乌气。逼比乡村版罗密欧与朱丽叶The Validator class, here as the Context, is responsible for receiving the user's request and delegating it to the strategys object. In the above code, we first create a Validator object, and then add some validation rules to the Validator object through the validator.add method. The validator.add method receives 3 parameters, as follows:Breaking the "Paganini Miracle"//256好，我送你一程吧。