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In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:Alter database example set single_user with rollback immediate少女武则天被唐太宗选为才人，太宗患病，武则天与太子李治产生恋情。太宗驾崩，李治即位，是为高宗。高宗喜女色不好政治，将武则天封为宸妃。武则天具有强烈的政治野心，将侄子武三思等安插在军机部门位居要职。为清除异己，武则天不惜亲手掐死自己女儿以嫁祸王皇后。王皇后被废，武则天被尊为天后，开始展示惊人的政治才能。高宗去世后，武则天废掉儿子中宗，自号“圣神皇帝”，改国号为周，进行了大刀阔斧的政治改革……内地企业家苏礼到香港发展，欲与安信旅游集团合作开发香港独一无二的生态度假村。在安信旅游集团主席顾东海为从美国留学归来的儿子顾浩民举办的酒会上，香港十大富豪之一的韦卡斯对苏礼狠狠地说：“感谢您在内地指证我的儿子，使他锒铛入狱，我决不会放过你“……周姑娘得意间，感觉还是很灵敏的，脑后长眼睛般。　　由于对强迫症侵入性思想的羞于启齿，以及普遍误解，许多患者多年来都没有寻求帮助，因此没有被诊断出来。"Do you mean that these 'dogs' that attacked position 142 are indeed some animals similar in appearance to common dogs?" I said.