Hmm.
Um  because otherwise it would sort of do greedy alignment , um , in regions where there was no real speech yet from the foreground speaker.
Mm - hmm.
Um ,  so that was one big factor that helped improve things and then the other thing was that , you know , as Liz said the  we f enforce the fact that , uh , the foreground speech has to be continuous. It cannot be  you cannot have a background speech hypothesis in the middle of the foreground speech. You can only have background speech at the beginning and the end.