On the last drafts, I focus on the words themselves, including the rub of vowels and consonants, stressed and unstressed syllables.

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In speech generally, consonants have higher frequencies than vowels, making conversations difficult to hear for some elderly people.

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The whistled language replaces each vowel or consonant with a whistling sound: two distinct whistles replace the five Spanish vowels, and there are four whistles for consonants.

UNESCO: Culture

It, in turn, became a success only when the Greeks had the clever idea of devising vowels to fill in the gaps between the consonants that had until then been adequate for recording Semitic tongues.

ECONOMIST: Language