in Thailand. Although the position of Kra-Dai in relation to Austronesian is still contested, some propose that Kra-Dai and Austronesian are genetically connected. Weera Ostapirat (2005) sets out a series of regular sound correspondences between them, assuming a model of a primary split between the two; they would then be co-ordinate branches. Weera Ostapirat (2013) continues to maintain that Kra-Dai and Austronesian are sister languages, based on some phonological correspondences. On the other hand, Laurent Sagart (2008) proposes that Kra-Dai is a later form of FATK, a branch of Austronesian belonging to subgroup Puluqic developed in Taiwan, whose speakers migrated back to the mainland, both to Guangdong, Hainan and north Vietnam around the second half of the 3rd millennium BCE. Upon their arrival in this region, they underwent linguistic contact with an unknown population, resulting in a partial relexification of FATK vocabulary. If Sagart's theory that Kra-Dai being a sub-group of proto-Austronesian migrated out of Taiwan and back to the coastal regions of Guangdong, Guangxi, Hainan, and (possibly) Vietnam is right, they would simply not have had a development resembling anything like the fate of other proto-Austronesian languages that migrated out of Taiwan to the Philippines and other islands in Southeast Asia. Besides various concrete evidences for a Kra-Dai existence in the present-day Guangdong, remnants of Kra–Dai languages spoken further north can be found in unearthed inscriptional materials and non-Han substrata in Min- and Wu Chinese. Wolfgang Behr (2002, 2006, 2009, 2017) points out that most of non-Sinitic words found in Chu inscriptional materials are of Kra-Dai origin. For example, the Chu graph for "one, once" written as (? < OC *nnəŋ) in the E jun qijie 鄂君啟筯 bronze tally and in Warring States bamboo inscriptions, which represents a Kra-Dai areal word; compare proto-Tai *hnïŋ = *hnɯŋ (Siamese 22nɯŋ, Dai 33nɯŋ, Longzhou nəəŋA etc.) "one, once". In the early 1980s, Wei Qingwen (韦庆稳), a Zhuang linguist, proposed that the Old Yue language recorded in the "Song of the Yue Boatman" is in fact a language ancestral to Zhuang. Wei used reconstructed Old Chinese for the characters and discovered that the resulting vocabulary showed strong resemblance to modern Zhuang. Later, Zhengzhang Shangfang (1991) followed Wei’s insight but used Thai script for comparison, since this orthography dates from the 13th century and preserves archaisms not found in modern pronunciation. Zhengzhang notes that 'evening, night, dark' bears the C tone in Wuming Zhuang