This is similar to the length opposition that occurs in the continuants . Navajo voiceless continuants are realized as fricatives. Approximants and vowels are sometimes called "frictionless continuants". In CC clusters of to voiced continuants, there is often a short transitional vowel. Geminate fricatives, nasals, and are realized as lengthened continuants. In languages with uvular consonants, stops are most frequent followed by continuants (including nasals). The voiced continuants at the beginning of stems vary with their voiceless counterparts , respectively. Another common distinction is between occlusives (stops, nasals and affricates) and continuants (all else). Continuants can be geminated word-medially. Continuants contrast with occlusives, such as plosives, affricates and nasals.