Harmony is a phonological pattern in which a sequence of vowels
and/or
consonants must have the same specification for a particular feature,
descriptively referred to as the harmonic feature. In the clear cases,
whenever the harmonic feature occurs in a word, the expected manifestation
of the harmony pattern is also encountered. For example, in
Capanahua (Loos 1969) where [nasal] is the harmonic feature,
a nasal
consonant always shares nasality with a preceding sequence containing
vowels, semivowels and/or laryngeals.