NSMutableArray *array = [NSMutableArray array];
[array addObjectsFromArray:@[@"北",@"上",@"广",@"深"]];
NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(2, 3)];
[array insertObjects:@[@"00",@"11",@"22"] atIndexes:indexSet];
PDNSLog(@"1 == %@",array);
[array removeObjectsInArray:@[@"00",@"11",@"22"]];
PDNSLog(@"2 == %@",array);
[array insertObjects:@[@"44",@"55",@"66"] atIndexes:indexSet];
PDNSLog(@"3 == %@",array);
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