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predicate sorted(a: array , min: int, max: int) requires a != null; requires 0 <= min <= max < a.Length; reads a; { forall j, k :: min <= j < k <= max ==> a[j] <= a[k] }```![在这里插入图片描述](https://img-blog.csdnimg.cn/20200519223605821.jpg?x-oss-process=image,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N3eV9zd3lfc3d5,size_16,color_FFFFFF,t_70#pic_center)
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