Approximant, voiceless fricative, tapped and trilled uvular pronunciations occur occasionally. The consonant written has been described as a prenasalized trill or trilled fricative . The Hydaburg dialect of Haida has a trilled epiglottal and a trilled epiglottal affricate ~. Increasing the stricture of a typical trill results in a trilled fricative. The phoneme has two allophones&colon; a trilled and a forward-flapped variation. It is not clear if they are actually trilled, or are simply non-sibilant affricates . Its calls are variable, often low-pitched trilled or gurgling whistles. Both allophones occur phrase-initially, but the trilled allophone is much more common. Wahgi has a similar trilled allophone of its lateral flap, , but it is voiceless. It is trilled if geminated to and weakly trilled if preceded by or . The male's song is a mix of fluted, whistled and trilled phrases, which varies geographically. Long consonants are written with double letters; is a trilled . A number of languages have trilled affricates such as and . It has consonants with trilled release such as and . The voiced alveolar stop may have trilled release depending on dialect.