We use information about the surrounding characters (character and character-type n-grams), as well as the presence or absence of words in the dictionary as features (Table 2).
dictionary features for word segmentation l s and r s are active if a string of length s included in the dictionary is present directly to the left or right of the present word boundary, and i s is active if the present word boundary is included in a dictionary word of length s. Dictionary feature d jk for POS estimation indicates whether the current word w j occurs as a dictionary entry with tag t k .