Vocalic harmony is the internal bringing together of vowels of the same class for the sake of greater euphony, while vocalic dissimilation is the deliberate insertion of another class of vowels, in order to prevent the disagreeable monotony arising from too prolonged a vowel harmony.
The only consonants are k,1, m, n and p, which with the gently aspirated h, the five vowels, and the vocalic w, make up all the letters in use.
Sumerian has a system of vowel harmony strikingly like that seen in all modern agglutinative languages, and it has also vocalic dissimilation similar to that found in modern Finnish and Esthonian.
Tribes that of one family with another shows also that some are vocalic and soft, others wide in the range of sounds, while a third set are harsh and guttural, the speaking of them (according to Payne) resembling coughing, barking and sneezing.
It is soft and harmonious, being highly vocalic in structure.
Inflexion.The Portuguese article, now reduced to the vocalic form o, a, os, as, was to (exceptionally also el, which still survives in the expression El-Rei), la, los, las in the old language.