here where they have a for Dallas TM that will first take in its own learn word representations and it right over the sentence in a left/right fashion and then they want to you know have context not just for sentence words that happened in the past but words that might be about to happen so they also run a backwards L s TM in the other direction from the right to the left and then they have this Bihar cable or sorry you sees me a deep model with multiple layers so they run two layers rails TM and then what they do is