question-answering datasets we just couldn't do as long because we weren't able to exploit bidirectional context whereas elmo was the old bi-directional image model and with an LST M and you know because they trained afford one of their backward one and the average of the representations that works quite well for shell models and that gets you that my directional context and that can help a ton and you know they performed us I still have performed this on some data sets because of that and then Bert basically figures out how to have