A further critical principle put forward by Knorozov was that of synharmony. According to this, Mayan words or syllables which had the form consonant-vowel-consonant (CVC) were often to be represented by two glyphs, each representing a CV-syllable (i.e., CV-CV). In the reading, the vowel of the second was meant to be ignored, leaving the reading (CVC) as intended. The principle also stated that when choosing the second CV glyph, it would be one with an echo vowel that matched the vowel of the first glyph syllable. Later analysis has proved this to be largely correct.