Nii language
Nii is a Trans–New Guinea language of the Chimbu–Wahgi branch spoken in the highlands of Papua New Guinea. Nii has an unusual number of lateral consonants: a typical dental approximant, , plus both dental and velar lateral fricatives,  and , which are optionally voiced between vowels and do not occur in initial position. References

Further reading
 

Chimbu–Wahgi languages
Languages of Western Highlands Province