Our findings suggest the presence of model combination effects in both generative parsers: when parses found by searching directly in the generative parser are added to a list of candidates from a strong base parser (the RNNG discriminative parser, RD<cite> (Dyer et al., 2016)</cite> ), performance decreases when compared to using just candidates from the base parser, i.e., B ∪ A → A has lower evaluation performance than B → A (Section 3.1).