Then, in 98.8% instances of such a state in the training data, the golden label action is Reduce-Left, suggesting a strong tendency of the state to become a parallel structure of adjectives, such as "black and white".
when we parse New York Times data using the baseline parser, the proportion of Reduce-Left action when facing the state decreases to 96.7%, suggesting that this tendency is not fully generalized as a rule for parallel structure of adjectives.