Morphophonology
The Athabaskan morphophonological process known as the "d-effect" occurs when 1st pl/dual iid- is prefixed to a verb stem. The following examples are taken from Phone, Olson and Martinez 2007: 39:
-iid- + classifier → ex. ‘óoƚkai’(hit’aaƚ(hiihmas(goohndé (hiidá (hiigá (naa’iidzii(haatƚee (hiiká' (Read more about this topic: Jicarilla Language