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On one hand, it could be a patrol route; on the other hand, the patrol officer is stationed at headquarters; on the third hand, when reinforcements are needed, all the officers are called in to patrol the streets; on the fourth hand, the belt could also be a suicide bomber's belt; on the fifth hand, the prosecutor himself went to look for clues, but doesn't searching for clues always end up serving the purpose of covering up past murders? Doesn't it randomly select from the current ones? And if there are no murders, will the prosecutor fail to meet his targets?