No lenition of intervocalic plosives (e.g. Lat. Voiced plosives are prenasalized in intervocalic position. They occur as the intervocalic allophone of glottal stop in many languages. Ultimate loss (deletion) of intervocalic consonant phonemes has resulted in Hawaiian long vowels and diphthongs. Flapping is a specific type of lenition, specifically intervocalic weakening. Taylor finds only occurs with intervocalic glottal stops. The ultimate loss (deletion) of intervocalic consonant phonemes has resulted in long vowels and diphthongs. These consonants are true voiced in intervocalic position. In the Celtic languages, the phenomenon of intervocalic lenition historically extended across word boundaries. Otherwise it is the intervocalic allophone of /d/. Long vowels may occur when intervocalic is elided. One hypothesis argues that Japanese developed "as a default, epenthetic consonant in the intervocalic position". Consonant assimilation occurs as a result of "intervocalic voicing". The fricatives , , and are added, primarily at the intervocalic position. The long consonants only appear in intervocalic position.