 The retroflex approximant 'r' is not permitted word-initially and instead becomes a lateral 'l'.This only affects verb roots, as they are the only part of speech that takes prefixes and are therefore the only possible part of speech for which word-initial and word-medial environmental effects can be observed.The verb "ra-ndi" 'throw', for instance, surfaces as "la-ndi" when inflected for third-person singular subjects (he/she/it), which are realised by invisible, or null morphemes.