/ð/ tends to be [d], so this is [dis],[1][21] /ə/ tends to be [α],so whether is [ˈwɛdα].[22] /v/ may be [w] or [f], so event may have [w] while even has [f]. It seems that [w] occurs at the start of a stressed syllable while [f] occurs at the start of an unstressed syllable.[4] There is alternation between [l] and [n], and the same speaker may alternate with words such as light and night, and both loud and number may have either [l] or [n] at the start.[20] Words with the ending sound of /s/ add long vowel / i:/ , such as Joyce [dʒɔɪs] pronunciation becomes Joysee [dʒɔɪsi:] In final consonant clusters, just as with many other varieties of English, there is a tendency for simplification, so the plosive at the end of words such as think and camp is often omitted. Deletion of coronal plosives /t/ and /d/ from word-final clusters has been reported to occur in about 76% of tokens, though this frequency is a little less if the function words and and just are excluded from the analysis.[23] L-vocalisation is common, so dark /l/ in the coda of a syllable is often pronounced as [ʊ], and fill may be [fiʊ] while tell is [teʊ], just as in London English (Cockney).[18] After back rounded vowels /l/ is often omitted, so school is [skuː] and wall is [wɔː].[22] Like many accents in Britain, Hong Kong English is non-rhotic, so /ɹ/ is only pronounced before a vowel.