... standing for X spanning fji. We choose b and β to balancespeed and performance on our development set. For our experiments, we set b = 40, β = 10−1 for X cells,and b = 15, β = 10−1 for S ... fk∼ ek for some k ∈ [i, j] and k∈ [i, j];2. fk ek for all k ∈ [i, j] and k [i, j];3. fk ek for all k [i, j] and k∈ [i, j].Next, we form all possible ... is problematic for the algorithm we use to tune the feature weights. Therefore wefilter our grammar according to the following prin-ciples, chosen to balance grammar size and perfor-mance on...