Additionally, some consider that vowel harmony must have existed at one time in Old Japanese, though there is no broad consensus. See the pertinent . Maiduan languages Nez Percé Nilotic languages Buchan Scots is a Scots dialect with vowel height harmony, compare "hairy", "really". This effect is blocked by voiced obstruents and certain consonant clusters: "baby", "lumpy". Somali Takelma Telugu Several Tibetic languages, including Lhasa Tibetan Tungusic languages, such as Manchu Tuvan Utian languages Urhobo Yurok and Qiang are unique in having rhotic vowel harmony. Other types of harmony Although vowel harmony is the most well-known harmony, not all types of harmony that occur in the world's languages involve only vowels. Other types of harmony involve consonants (and is known as consonant harmony). Rarer types of harmony are those that involve tone or both vowels and consonants (e.g. postvelar harmony). Vowel–consonant harmony Some languages have harmony processes that involve an interaction between vowels and consonants. For example, Chilcotin has a phonological process known as vowel flattening (i.e. post-velar harmony) where vowels must harmonize with uvular and pharyngealized consonants. Chilcotin has two classes of vowels: "flat" vowels non-"flat" vowels Additionally, Chilcotin has a class of pharyngealized "flat" consonants . Whenever a consonant of this class occurs in a word, all preceding vowels must be flat vowels. If flat consonants do not occur in a word, then all vowels will be of the non-flat class: Other languages of this region of North America (the Plateau culture area), such as St'át'imcets, have similar vowel–consonant harmonic processes. Syllabic synharmony Syllabic synharmony was a process in the Proto-Slavic language ancestral to all modern Slavic languages. It refers to the tendency of frontness (palatality) to be generalised across an entire syllable. It was therefore a form of consonant–vowel harmony in which the property 'palatal' or 'non-palatal' applied to an entire syllable at once rather than to each sound individually. The result was that back vowels were fronted after j or a palatal consonant, and consonants were palatalised before j or a front vowel. Diphthongs were harmonized as well, although they were soon monophthongized because of a tendency to end syllables with a vowel (syllables were or became open). This rule remained in place for a long time, and ensured that a syllable containing a front vowel always began with a palatal consonant, and a syllable containing j was always preceded by a palatal consonant and followed