for which see the grammars. One usage which presents serious difficulties to the users of the dictionary must be mentioned here. ka- is the prefix for singular nouns of the ka/bu class. This class contains not only nouns proper to it, but in addition most other nouns can be converted to this class; in the latter case the resultant noun is a diminutive. In many cases sound changes obscure the relationship between the original noun and the diminutive: ente, cow; akate, small cow. ejjinja, rock; akayinja, stone, endabirwamu, mirror; akalabirwamu, small mirror.