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}2.4D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:东州市审计局经责处处长徐咏萍带领叶开、黄柯、袁忠诚、金逗逗组成的审计小组，在局长周维海和副局长董寿年的领导下，审计出东州钢铁公司总经理章劲松擅自挪用国有资金炒股的违法事实。在审计过程中，审计小组排除干扰，对东州市人民医院院长谭启聪的违规行为坚决查处；在医保项目的审计中发现了民营普济医院的骗保线索，为医保中心挽回一百多万元的损失。在审计署领导和市委书记的支持下，终于调查清楚北江区副区长万文杰与国土储备中心主任郭明恒勾结侵吞国家复垦资金和高速路建设补偿资金的贪腐大案。I am countless I run into one I go to sleep with you