It is especially pertinent to what appears to be confusion of voiceless and voiced dental stops, in which signs -dV- and -tV- are employed interchangeably in different attestations of the same word.
This regularity is the most consistent in the case of dental stops in older texts;[2] later monuments often show irregular variation of this rule.
Even with older texts being apparently more conservative and consistent in notation, there are significant variations in vowel length in different forms of the same lexeme.
[8] One of the more characteristic phonological features common to all Anatolian languages is the lenition of the Proto-Indo-European voiceless consonants (including the sibilant *s and the laryngeal *ḫ) between unstressed syllables and following long vowels.
In transcriptions of Anatolian languages written in cuneiform, the letter ‹ḫ› represents a sound (Proto-Anatolian *H) going back to the laryngeal *h₂ and probably but less certainly also *h₃.
[9] In addition to the laryngeals, Common Anatolian was long also thought to be the only daughter to preserve the three-part velar consonant distinction from Proto-Indo-European.
The liquids and nasals are inherited intact from Proto-Indo-European, and so is the glide *w. No native Proto-Anatolian words begin with *r-.