To maximally reduce ambiguity, we propose to apply s 1 in Equation (9) if both of the following conditions hold, (1) x t ∈ C l (2) There exists τ s.t.
|τ − t| < k, and x τ ∈ C l we will impose a non-uniform prior on y t if x t ∈ C l "collocates", within k tokens, with another word that belongs to C l .