There is some disagreement as to how to count Luganda's noun classes. Some authorities count singular and plural forms as two separate noun classes, but others treat the singular-plural pairs as genders. By the former method, there are 17 classes, and by the latter there are 10 since there are two pairs of classes with identical plurals and one class with no singular-plural distinction. The latter method is consistent with the study of non-Bantu languages. Applying the method to Luganda gives ten noun classes, nine of which have separate singular and plural forms. This is the usual way to discuss Luganda but not when discussing Bantu languages, generally. In addition, Luganda has four locative classes, e, ku, mu, and wa.