The Maori alphabet is very restricted, consisting of 15 letters: h, k, m, n, p, r, t, w, a, e, i, o, u, wh, ng. These letters can be classified into:
Eight consonants, h, k, m, n, p, r, t, w.
Two digraphs, wh, and ng, which may be included with the consonants.
Five vowels, a, e, i, o, u.