The content of the lessons has scarcely been changed, and so materials originally intended for use by missionaries teaching themselves Hmong while living in a mountain-top village still contain the vocabulary of pig-feeding, cooking on an open fire, and Bible stories, The basics of White Hmong pronunciation, grammar, and usage are presented ... White Hmong and Mong Leng people speak mutually intelligible dialects of the Hmong language with some differences in pronunciation and vocabulary. One of the most obvious differences is the use of the aspirated /m/ in White Hmong by the sound of "H", which is used when it is written in Romanized Popular Alphabet.