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Much less common are labial affricates, such as [pf] in German, and velar affricates, such as [kx] in Setswana (written kg) or High Alemannic Swiss German dialects. Worldwide, only a few languages have affricates in these positions, even though the corresponding stop consonants are virtually universal. Also quite uncommon are alveovelar affricates where the fricative is lateral, such as the [tl] sound found in Nahuatl and TotonacThe Totonac are a Native American people in the state of Veracruz, Mexico. Totonac" is also the name of their native language; most now speak the Spanish language, some in addition to the traditional tongue. The Totonac built the Pre-Columbian city of El.
An affricate is a single speech segment, not a sequence of two sounds. In fact, in some languages (e.g. Polish) affricate and "stop plus fricative" clusters contrast phonemically, as in czysta 'clean (f.)' [tʃ...] versus trzysta 'three hundred' [t|ʃ...] (the vertical line separates segments). In English the cluster [ts] occurs, as in bats, but it doesn't function as an affricate.