This reads a bit unfriendly. But anyway I read their FAQ and it's allowed to hand in offline-prepared data but size*2 will be added to your result so its typic

This reads a bit unfriendly. But anyway I read their FAQ and it's allowed to hand in offline-prepared data but size*2 will be added to your result so its typically a disadvantage unless your statically prepared data has an exceptionally high knowledge content.