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Gui–Liu Mandarin (simplified Chinese:桂柳官话;traditional Chinese:桂柳官話) is a group ofSouthwestern Mandarin varieties spoken predominantly in theGuangxi Zhuang Autonomous Region. It is named after the cities ofGuilin andLiuzhou, two main cities in the northeast of the province. The second edition ofThe Language Atlas of China divides the group into three subbranches, namely Xiangnan (Chinese:湘南小片), Guibei (Chinese:桂北小片), and Qiannan (Chinese:黔南小片), of which Guibei is spoken in the highest number of counties.^[1]

The initial system of Guiliu varieties are rather heterogenous from each other yet nonetheless still share notably characteristics. A harmonised initial system of Guilin^[2] and Liuzhou^[3] Mandarin is shown below. Sounds which only occur in Liuzhou are shown in red.

• Guiliu Mandarin generally follows the devoicing pattern of Middle Chinese voiced obstruents of other Mandarin varieties. In the平píng tone, they become aspirated stops but in the仄zé tones, they become unaspirated:皮: Guilin/pʰi²¹/, Liuzhou/pʰi³¹/ but辦: Guilin/pã²⁴/, Liuzhou/pã²⁴/.
• The日rì initial has generally been lost or have become an initial palatal glide[j-]:人: Guilin/in²¹/, Liuzhou/in³¹/;讓: Guilin/iaŋ²⁴/, Liuzhou/iaŋ²⁴/.
• The疑yí initial has mostly been preserved in non-palatal syllables as/ŋ/:我 Guilin/ŋo⁵³/, Liuzhou/ŋo⁵⁴/.

Like other Southwestern Mandarin, most Guiliu varieties have lost theirretroflex consonants. The main exception is the Baishi variety which retains them as/tʃ/,/tʃʰ/ and/ʃ/. Amongst the varieties which do not retain retroflexes as distinct consonants, Guilin universally converts old retroflexes into alveolar sibilants. Liuzhou mostly converts them into alveolars but before/y/ (which becomes/u/ in Guilin à la Standard Mandarin in this context), they become alveolar-palatals.^[4]

The degree to which palatalisation operates within Gui-Liu varieties is subject to variation between varieties. Some varieties,Lipu and Baishi, completely lack palatalisation of any form.^[4] In Liuzhou, palatalisation mainly operates on alveolar sibilants before[i] and[y] except with the rhymes/in/,/ie/ and/iẽ/. As for Guilin Mandarin, it palatalises both velar consonants and alveolar sibilants before all instances of a palatal element. The situation is summarised in the following table where cells in which palatalisation has occurred are coloured yellow:

Shown below is a harmonised list of rhymes between Guilin^[2] and Liuzhou Mandarin.^[3] Those which only occur in Guilin are in light blue where as those which only occur in Liuzhou are in green.

• Monophthongisation of historical diphthongs *ai and *au to/æ~ɛ/ and/ɑ~ɔ/ has occurred in many varieties.
• Nasalisation of historic coda/n/ has occurred after/a/ and/e/ in many varieties.
• Loss of the distinction between coda/n/ and/ŋ/ (with them becoming complementary to each other) has occurred in many varieties.

Most Guiliu varieties distinguish four tones, corresponding mostly to the four tones of Standard Mandarin. However, some varieties may preserve a distinct tone reflecting old checked, or stop coda, syllables. In Liuzhou this tone is mostly vestigial but it remains robust in varieties such as Baishi. In all other varieties, this tone has merged into the Light level tone.

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