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    NSSortDescriptor *frequencyDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"" ascending:NO comparator:^(id obj1, id obj2) { return [obj1 compare:obj2 options:NSNumericSearch]; }];

    NSEnumerator * enumerator = [arr_distance objectEnumerator];

    NSArray * descriptors = [NSArray arrayWithObjects:frequencyDescriptor, nil];

    NSArray * sortedArray = [arr_distance sortedArrayUsingDescriptors:descriptors];

    enumerator = [sortedArray objectEnumerator];

    NSLog(@"sortedArray = %@",sortedArray);

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