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'a) was a voiced velar fricative, while the voiceless rhotic and lateral are written with digraphs ?? and ?? . Unlike virtually all modern Tibetan languages, the Old Tibetan orthography did not contain silent letters, and the words were pronounced as written.

The following table is based on Hill's analysis of Old Tibetan:

In Old Tibetan, the glide occurred as a medial, but not as an initial.The Written Tibetan letter ? w was originally a digraph representing two Old Tibetan consonants .

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