as by French (in the former Indochina colonies) and later American English, and they may be confused with varieties spoken by minorities living today in the United States, Europe or elsewhere in Asia (where their varieties may have been assimilated locally, but separately in each area, with other Hmong varieties imported from Laos and China): Hmong Dô (Vietnam), Hmong Don (Vietnam, assumed). The Centers for Disease Control and Prevention (CDC) stated that the White and Leng dialects "are said to be mutually intelligible to a well-trained ear, with pronunciation and vocabulary differences analogous to the differences between British and American English." Several Chinese varieties may overlap with or be more distinct than the varieties listed above: Dananshan Miao (, ; called in Northern Hmong), the basis of the Chinese standard of the Chuanqiandian cluster Black Miao (subgroups: , /; Chinese: , ) Southern Hmong (subgroups: , , , ; includes Mong Leng) Northern Hmong (subgroups: , /, ) Western Sichuan Miao (Chinese: , ) In the 2007 request to establish an ISO code for the Chuanqiandian cluster, corresponding to the "first local dialect" () of the Chuanqiandian cluster in Chinese, the proposer made the following statement on mutual intelligibility: Varieties in Laos According to the CDC, "although there is no official preference for one dialect over the other, White Hmong seems to be favored in many ways": the Romanized Popular Alphabet (RPA) most closely reflects that of White Hmong (Hmong Daw); most educated Hmong speak White Hmong because White Hmong people lack the ability to understand Mong Leng; and most Hmong dictionaries only include the White Hmong dialect. Furthermore, younger generations of Hmong are more likely to speak White Hmong, and speakers of Mong Leng are more likely to understand White Hmong than speakers of White Hmong are. Varieties in the United States Most Hmong in the United States speak White Hmong (Hmoob Dawb) and Mong Leng (Moob Leeg), with around 60% speaking White Hmong and 40% Mong Leng. The CDC states that "though some Hmong report difficulty understanding speakers of a dialect not their own, for the most part, Mong Leng seem to do better when understanding both dialects." Phonology The three dialects described here are Hmong Daw (also called White Miao or Hmong Der), Mong Leeg (also called Blue/Green Miao or Mong Leng), and Dananshan (Standard Chinese Miao). Hmong Daw and Mong Leeg are the two major dialects