The 'v' means vowel letter, and the 'c' means consonant letter, so 'vcccv' would mean a string of five letters: vowel-consonant-consonant-consonant-vowel. Usually we're only interested if the first vowel is stressed. The two most important such strings are VCV and VCC, the first with a long first vowel, the second with a short one, as in later and latter.
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