Which old literary languages represent the major divisions of Sino-Tibetan?

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The major divisions of the Sino-Tibetan language family are represented by three primary old literary languages: Chinese, Tibetan, and Burmese. These languages serve as the representatives for the Sinitic, Tibetic, and Burmic divisions, respectively.1

While these three are the primary literary representatives, other languages are categorized as "minor literary" languages within the Tibeto-Burman group, including Xixia (Tangut), Newar, Meitei (Manipuri), Naxi-Moso, Yi (Lolo), Bai (Minchia), and Pyu.2

It is important to note that while Thai (Siamese) was historically considered a division of Sino-Tibetan, this relationship is now more commonly viewed as nongenetic, with shared vocabulary likely resulting from cultural borrowing rather than derivation from a common ancestor.1