Proto-Slavic and contrasted only after alveolars and labials. Acoustically they are more similar to alveolars than bilabials. Palatalization only occurs when one of these four alveolars is preceded by a strong "i". In Western Bengali apical alveolars are replaced by apical post-alveolars. In some Zoque languages, does not palatalize velar consonants but it turns alveolars into palato-alveolars. The palatalized alveolars , are typically realized as alveolo-palatals , . Sometimes palatalized alveolars or dentals can be analyzed in this manner as well. Linguolabials can be distinguished from bilabials and alveolars acoustically by formant transitions and nasal resonances. Otherwise, alveolars and dentals are typically called "taps" and other articulations "flaps". Alveolars are across the middle of the triangle from side to side. Otherwise, alveolars are typically called "taps", and other articulations are called "flaps".